Grade 9 Science Worksheets

Learning Objectives

• Explain how redshift and Hubble’s law connect to the expansion of the universe and its age over time.
• Describe how cosmic microwave background (CMB) measurements and anisotropies provide benchmarks for early-universe conditions.
• Connect primordial abundances of hydrogen, helium, and lithium to Big Bang nucleosynthesis and early cosmic timescales.

Learning Objectives

• Explain how Kepler’s laws describe planetary and satellite orbits
• Use Newton’s law of universal gravitation to justify orbital motion and speed changes
• Relate orbital period to orbital size and connect escape velocity to gravitational binding+ Show more

Learning Objectives

• Explain how a rotating protoplanetary disk can lead to the formation of the solar system’s planets.
• Use meteorite evidence and isotopic radiometric dating to describe the timing of early Solar System events.
• Connect angular momentum distribution and volatile gradients to differences between inner rocky planets and outer gas giants.

Learning Objectives

• Explain how stellar mass affects the path of stellar evolution from formation through later stages.
• Describe how nuclear fusion processes change during a star’s main-sequence and post-main-sequence evolution.
• Interpret how Hertzsprung–Russell (H–R) diagrams, spectral classification, and supernova remnants provide evidence for evolution.

Learning Objectives

• Use scenario analysis and integrated assessment to compare mitigation and adaptation options under uncertainty.
• Apply cost-benefit evaluation and lifecycle assessment to identify trade-offs among environmental, economic, and social outcomes.
• Explain how decision models can support equitable, resilient, and sustainable policy choices.

Learning Objectives

• Evaluate how transitions between energy systems affect greenhouse gas emissions using life-cycle and scenario thinking.
• Compare reliability, affordability, and emissions-reduction trade-offs when integrating renewables and storage.
• Explain how grid capacity and air-quality considerations change with shifting electricity mixes.

Learning Objectives

• Explain how hazard risk depends on occurrence, frequency, and consequences for natural events
• Use exposure, vulnerability, and cascading system effects to evaluate community and infrastructure susceptibility
• Connect hazard mapping and return-period information to mitigation and planning decisions

Learning Objectives

• Use evidence from atmospheric CO2 records and global temperature trends to explain why climate change is linked to human activity.
• Connect land-use change (deforestation, urbanization) to changes in carbon storage and regional ecosystems.
• Describe how changes in precipitation patterns and biosphere/hydrosphere indicators can occur at regional to global scales.

Learning Objectives

• Explain how soil conservation, irrigation, and watershed management affect land and water systems.
• Analyze how different land-use choices influence infiltration, runoff, groundwater levels, and ecosystem resilience.
• Evaluate trade-offs among food production, biodiversity, and long-term watershed health.

Learning Objectives

• Explain how energy flows one direction through food chains, including energy losses at each step.
• Describe how matter cycles through biological systems by rearranging atoms during photosynthesis and cellular respiration.
• Use trophic level ideas and biomass trends to interpret how organisms incorporate and redistribute energy and matter.

Learning Objectives

• Compare how different energy sources and mineral extraction methods affect the environment and society across the life cycle.
• Evaluate trade-offs among emissions, land disturbance, water use, and remediation when making resource choices.
• Use supply constraints and long-term planning to justify more sustainable regional decisions.

Learning Objectives

• Explain how photon energy depends on frequency and how that connects to the electromagnetic spectrum.
• Describe how electromagnetic waves interact with matter through emission and absorption lines.
• Use wavelength and attenuation ideas to reason about signal penetration, scattering, and detector response.

Learning Objectives

• Explain how modulation and multiplexing map source information onto carrier signals in different communication channels.
• Compare pulse-code modulation (PCM) and analog amplitude modulation by bandwidth, fidelity, and noise susceptibility.
• Identify how different multiplexing schemes (TDM, FDM, WDM) affect channel capacity and signal integrity.

Learning Objectives

• Explain how bandwidth, signal-to-noise ratio (SNR), and modulation affect transmission quality in digital and analog systems
• Use sampling criteria and channel capacity ideas to predict limits on data rates
• Compare error-detection/correction techniques and how coding reduces bit error rate+ Show more

Learning Objectives

• Describe wave behavior using amplitude, frequency, wavelength, and phase.
• Use wave speed relationships (v = fλ) to solve for missing quantities.
• Explain how superposition leads to interference and how reflections can affect wave patterns.

Learning Objectives

• Use the idea of a system and its boundaries to track energy transfers and identify what is included or excluded from an energy accounting model.
• Apply conservation of energy to closed and open systems by representing energy reservoirs and transfers mathematically.
• Distinguish conservative and non-conservative interactions in terms of how energy moves between system components and environments.

Learning Objectives

• Explain how predator-prey, competition, and mutualism connect species in an ecosystem network.
• Describe how abiotic factors like temperature and nutrient availability can change survival and population size.
• Use interaction networks to predict how changes in one population can cascade through a community.

Learning Objectives

• Use the heat transfer relationships to calculate thermal energy changes from mass and temperature change
• Explain how conduction, convection, and radiation move thermal energy and how signs indicate direction of energy flow
• Apply conservation of energy ideas to closed-system thermal processes such as heating and phase changes

Learning Objectives

• Calculate kinetic energy and gravitational potential energy and relate them to mechanical energy in real situations.
• Explain how work and power are connected to energy transfer and energy conservation.
• Interpret how friction and other non-conservative forces change a mechanical energy budget.

Learning Objectives

• Explain the difference between power and energy and compute energy over time using power ratings.
• Analyze system performance using efficiency and accounting for energy losses across a process.
• Compare energy budgets for two generation sources using power, time, and throughput reasoning.

Learning Objectives

• Explain how multiple types of evidence (fossil, anatomical, and molecular) support common ancestry.
• Describe how transitional fossils, homologous structures, and DNA/molecular sequences help build evolutionary explanations.
• Use dating methods and biogeographic patterns to connect evidence to time and diversification.

Learning Objectives

• Explain how heritable variation and selective pressures lead to differential survival and reproduction in natural selection.
• Distinguish directional, stabilizing, and disruptive selection using fitness and allele-frequency ideas.
• Use examples such as finch beaks and antibiotic resistance to describe population-level adaptive change.

Learning Objectives

• Construct and interpret phylogenetic trees using morphological characters and molecular sequence data.
• Explain cladistic ideas such as shared derived characters and the role of outgroups in defining clades.
• Compare common tree-building approaches (parsimony and molecular distance) and describe how molecular clocks calibrate time.

Learning Objectives

• Explain how reproductive isolation, geographic separation, and genetic divergence can lead to speciation
• Compare allopatric and sympatric speciation and identify real-world examples of each
• Describe how hybrid zones and polyploidy can influence the formation of new species+ Show more

Learning Objectives

• Explain how land-use change, invasive species, pollution, and resource extraction can reduce biodiversity.
• Interpret evidence from real-world examples (deforestation, coral reef degradation, agricultural runoff) to evaluate ecosystem impacts.
• Describe trade-offs between conservation goals, provisioning services, and socioecological outcomes.

Learning Objectives

• Explain how disturbances can change ecosystem interactions and environmental conditions.
• Describe how feedback processes and recovery rates influence whether an ecosystem returns to its original state.
• Use evidence from population trends and community structure to argue for gradual versus rapid ecosystem shifts.+ Show more

Learning Objectives

• Explain how nutrient cycling processes move matter through ecosystems using reservoirs and fluxes.
• Describe carbon, nitrogen, and phosphorus pathways, including key microbial roles (decomposition, fixation, mineralization, sedimentation).
• Evaluate how human changes (like fertilizer runoff) can alter cycling rates and affect primary productivity and long-term nutrient availability.

Learning Objectives

• Explain how carrying capacity and density-dependent/independent factors regulate population size
• Describe how competition, predation, and disease affect population dynamics and community composition
• Use basic mathematical ideas (like logistic growth) to interpret population regulation patterns

Learning Objectives

• Explain how photosynthesis and cellular respiration transfer energy through ecosystems.
• Analyze how net primary productivity (NPP) and biomass accumulation affect food availability for consumers.
• Describe how organisms cycle carbon and oxygen through photosynthesis and respiration.

Learning Objectives

• Explain how energy and biomass move through trophic levels in a food web
• Use ecological efficiency and production-to-biomass ideas to describe energy loss at each step
• Interpret trophic pyramids and connect top-down and bottom-up control to predator-prey outcomes

Learning Objectives

• Explain how cell membranes regulate transport of nutrients and wastes to support homeostasis
• Describe how cellular energy use (ATP and chemical reactions) helps cells build structures and grow
• Use evidence such as uptake rates and growth patterns to connect cellular structure to cell function

Learning Objectives

• Explain how DNA replication and chromosome segregation during meiosis help transmit hereditary information.
• Describe the roles of gametes and the zygote in forming an offspring with a new set of chromosomes.
• Connect DNA fidelity and repair errors to observable inheritance patterns and variation.

Learning Objectives

• Explain how dominant and recessive alleles affect genotype-to-phenotype outcomes in monohybrid crosses.
• Use probability ideas and Punnett squares to predict genotype and phenotype ratios.
• Interpret simple pedigrees and recognize limits of Mendelian patterns when inheritance is not fully simple.

Learning Objectives

• Explain how multiple molecular and cellular processes create heritable genetic variation.
• Describe how changes in DNA sequence and chromosome structure can affect gene expression and proteins.
• Connect individual genetic changes to population-level variation and shifts in allele frequencies.

Learning Objectives

• Explain how wave speed, frequency, and wavelength are related for waves traveling in the same medium.
• Predict how wavelength changes when frequency changes, while wave speed stays constant.
• Use the relationship v = fλ to interpret real-world wave situations.

Learning Objectives

• Explain how frequency, wavelength, and amplitude describe different features of a wave
• Predict how changing one wave parameter changes a wave’s observable pattern or signal description
• Relate wave properties to energy and to different representations of the same wave

Learning Objectives

• Explain how waves transfer energy and, in some cases, information without transporting matter overall
• Relate frequency, wavelength, and amplitude to observable wave behavior
• Use wave properties to predict how changes affect wave patterns and energy carried

Learning Objectives

• Explain how net force is determined by adding forces that act in different directions.
• Predict how net force affects the magnitude and direction of acceleration.
• Use evidence from velocity changes to infer whether the net force is zero or nonzero.

Learning Objectives

• Explain particle conservation by describing how atoms rearrange during chemical reactions.
• Use the particulate view to justify why total mass and the number of atoms of each element stay the same.
• Interpret reactants and products as collections of atoms rather than matter being created or destroyed.

Learning Objectives

• Explain how balanced and unbalanced forces affect net force and changes in velocity.
• Predict the direction of acceleration using the direction of the net force.
• Describe how velocity changes can involve speed changes, direction changes, or both.

Learning Objectives

• Explain how distance and time relate to speed using data and patterns
• Describe how changing speed relates to acceleration
• Use motion relationships to interpret or predict what happens over time

Learning Objectives

• Explain how heat transfer happens due to temperature differences between a system and its surroundings.
• Describe how work transfers energy through forces acting over a distance.
• Use energy-transfer language to distinguish what comes from or goes to the surroundings during physical and chemical changes.

Learning Objectives

• Use measurements and models to support or challenge explanations of motion, energy transfer, forces, and waves.
• Evaluate competing explanations by comparing them to quantitative data and by checking whether key assumptions are stated clearly.
• Connect variables using model-based patterns and explain how predictions relate to observed results.

Learning Objectives

• Compare physical and chemical changes using ideas of energy transfer and system–surroundings interactions.
• Explain how endothermic and exothermic processes relate to observed temperature changes.
• Connect energy transfer to particle behavior in phase changes and to bond rearrangements in chemical changes.

Learning Objectives

• Interpret speed-time and distance-time data to infer acceleration and its direction.
• Use changes in speed over equal time intervals to determine whether acceleration is roughly constant or changing.
• Explain how the shape or slope of data curves relates to acceleration.

Learning Objectives

• Explain how forces can change an object’s motion through push or pull effects
• Distinguish between contact forces and non-contact forces using real-world Alberta examples
• Describe how force magnitude and direction combine to predict qualitative motion

Learning Objectives

• Explain how natural selection works using the ideas of variation, heritability, selective pressure, and reproductive success.
• Define fitness and describe how it depends on environmental conditions.
• Compare natural selection and artificial selection and predict how populations may change over generations.+ Show more

Learning Objectives

• Explain how the Moon and Sun create tidal forces on Earth’s oceans.
• Describe the difference between spring tides and neap tides.
• Predict how local geography and ocean basin features can change tidal range and currents.