Grade 8 Science Worksheets

Learning Objectives

• Describe the major reservoirs of Earth’s water and compare the relative amounts of freshwater and saline water.
• Explain how climate, topography, and geology influence where water is stored and how accessible it is for human use.
• Interpret how uneven freshwater distribution can affect water security and require regional cooperation.

Learning Objectives

• Explain how net force affects an object’s acceleration, including changes in speed and/or direction.
• Distinguish between balanced and unbalanced forces using the idea of net force being zero or not zero.
• Use force magnitude and direction to predict the direction of acceleration.

Learning Objectives

• Explain how atomic bonding and molecular structure relate to observable substance properties.
• Use particle models to predict patterns in melting/boiling state, solubility, and reactivity trends.
• Differentiate properties of polar and nonpolar substances and of extended structures such as polymers and crystals.+ Show more

Learning Objectives

• Explain how advection, dispersion, and diffusion move contaminants through surface and subsurface water
• Describe how sorption and biodegradation/biogeochemical reactions affect contaminant fate and attenuation
• Interpret how contaminant plumes form and migrate in aquifers, including preferential flow paths+ Show more

Learning Objectives

• Differentiate physical changes from chemical changes using evidence such as new substances and permanent color change.
• Explain why some changes are reversible (state or form changes) while others are not (atoms rearrange into new substances).
• Connect phase changes like melting/freezing and boiling/condensation to the idea of reversibility under different conditions.

Learning Objectives

• Describe and distinguish conduction, convection, and radiation as three modes of thermal energy transfer.
• Use evidence from everyday situations to explain how heat moves from warmer to cooler regions.
• Connect particle motion and fluid motion to conduction and convection, and connect electromagnetic waves to radiation.+ Show more

Learning Objectives

• Explain how Pascal’s principle allows pressure to be transmitted through a confined fluid
• Calculate and interpret force multiplication using piston area and hydraulic pressure
• Describe how hydraulic systems apply force remotely and why seals and fluid properties matter+ Show more

Learning Objectives

• Explain conservation of energy using energy transfer and energy conversion within a system
• Differentiate between kinetic energy, potential energy, and thermal energy during motion and collisions
• Use energy accounting to predict how speed and temperature change when energy stays in the system or leaves it

Learning Objectives

• Explain how natural selection can change a population’s trait distribution over generations
• Identify the roles of heritability and variation in adaptation
• Describe how changing environmental pressures can shift selection and lead to evolutionary change+ Show more

Learning Objectives

• Explain how matter cycles through ecosystems rather than being used up once
• Describe key pathways in the water, carbon, and nitrogen cycles
• Connect decomposition to the return of nutrients that producers need

Learning Objectives

• Explain how stream stage measurements can be converted into discharge using rating curves and stage–discharge relations
• Identify common instruments used to measure water quantity and water quality (e.g., flow meters, conductivity/turbidity sensors, dissolved oxygen probes, piezometers)
• Interpret hydrographs and time series data to discuss baseflow separation and trend detection

Learning Objectives

• Explain how decomposers (such as fungi and bacteria) break down dead matter and waste
• Describe how decomposition supports biogeochemical cycling by returning nutrients to the environment
• Analyze how decomposition affects energy flow and ecosystem productivity

Learning Objectives

• Explain how homeostasis keeps internal conditions stable for cells to function effectively
• Describe how negative feedback systems respond to changes and return variables toward a set range
• Identify examples of homeostatic control involving temperature, water balance, blood chemistry, and oxygen levels+ Show more

Learning Objectives

• Explain key concepts of integrated water resources management, including allocation, supply planning, and governance.
• Describe how monitoring and adaptive management support decision-making in water systems.
• Analyze trade-offs among municipal, agricultural, and ecological water demands.

Learning Objectives

• Explain how genes and alleles influence inherited traits in offspring.
• Differentiate dominant and recessive alleles using allele-pair outcomes.
• Use evidence from observed variation to justify that inherited factors affect survival and reproduction.

Learning Objectives

• Explain how internal structures in living organisms help with survival functions such as movement of materials, gas exchange, and digestion.
• Describe how external structures (like beaks, teeth, shells, or leaves) relate to feeding and protection.
• Use structure–function relationships to predict how an organism meets its needs in different environments.

Learning Objectives

• Differentiate point sources from nonpoint sources of water contamination using examples.
• Explain how nutrient enrichment can lead to eutrophication and oxygen depletion in aquatic systems.
• Describe how sediment loading and chemical pollutants move through land-to-water pathways.

Learning Objectives

• Identify multiple types of evidence for natural selection, including fossils, anatomical similarities, and genetic/function links.
• Explain how environmental pressures can increase the survival or reproductive success of certain heritable traits.
• Connect changes in trait frequency over generations to the process of adaptation.

Learning Objectives

• Explain how ecosystem stability relates to resilience after disturbances
• Describe how changes in population size affect resources and community development
• Use evidence from a text to identify main ideas about ecosystem recovery+ Show more

Learning Objectives

• Explain how biotic interactions (predation, competition, disease, and mutualism) influence population sizes.
• Describe how changes in populations can affect energy flow and matter cycling in an ecosystem.
• Use evidence from a text to identify main ideas and make claims supported by ecological concepts.

Learning Objectives

• Explain the purpose of major drinking-water and wastewater treatment stages (coagulation, flocculation, sedimentation, filtration, and disinfection).
• Describe how treatment processes remove suspended solids, pathogens, and dissolved contaminants.
• Compare tertiary approaches such as biological nutrient removal and engineered wetlands.+ Show more

Learning Objectives

• Explain how surface water and groundwater exchange occurs along streams through gaining and losing reaches and baseflow.
• Analyze how permeability, hydraulic gradients, and recharge zones influence exchange rates.
• Describe how river stage and seasonal variability change exchange and affect nutrient cycling, contaminant transfer, and habitats.

Learning Objectives

• Identify the desired outcome and the real-world problem context in an engineering design challenge
• Write measurable goals and connect them to practical limitations and constraints
• Explain how framing a problem supports generating multiple viable solution approaches

Learning Objectives

• Explain how atmospheric pressure affects the boiling point of liquids.
• Describe how barometers measure atmospheric pressure and how pressure gradients drive wind.
• Use the idea of pressure changes with altitude (in kPa) to predict outcomes for everyday systems.

Learning Objectives

• Explain how models can be used to test design ideas and compare results to expectations.
• Use evidence from model outputs to refine a design and justify which features are likely to improve performance.
• Describe how comparing alternatives in a model can reveal causes of performance changes.

Learning Objectives

• Explain how optimization balances performance goals with constraints to choose the best solution among alternatives.
• Identify criteria and constraints and describe how tradeoffs affect engineering and design decisions.
• Use evidence to justify why one design is superior for a specific real-world situation.

Learning Objectives

• Explain how earthquake locations form belts that relate to tectonic plate boundaries
• Describe how seismic wave observations provide indirect evidence about Earth’s internal structure
• Use evidence from seismic timing and wave behavior to connect tectonic motion to patterns of earthquakes and volcanic activity

Learning Objectives

• Explain Bernoulli’s principle using the relationship between fluid speed and pressure in streamlined flow.
• Use continuity and Bernoulli ideas to predict how pressure changes when a fluid moves through changing cross-sectional area.
• Apply Bernoulli’s principle to real-world examples such as lift on airfoils and flow in constricted pipes.+ Show more

Learning Objectives

• Explain how gravity provides the centripetal acceleration needed for curved orbits
• Describe how orbital distance affects orbital speed and orbital period
• Interpret how satellite motion relates to larger astronomical systems

Learning Objectives

• Explain Archimedes’ principle and relate buoyant force to the weight of displaced fluid.
• Use density and displaced volume relationships to compare buoyant force in different fluids.
• Predict whether an object floats, sinks, or is neutrally buoyant by comparing forces.+ Show more

Learning Objectives

• Identify multiple lines of evidence that support the idea that Earth’s lithospheric plates have moved over long periods of time.
• Explain how geologic patterns such as rock age, mountain belt alignment, and seafloor features relate to past plate motion.
• Interpret statements about plate boundaries and Earth history as true or false based on scientific evidence.

Learning Objectives

• Explain how human resource use can change Earth systems (land, water, and air).
• Use cause-and-effect reasoning to connect specific human actions to environmental outcomes.
• Identify evidence of system-level impacts such as habitat loss, pollution, and altered cycles.

Learning Objectives

• Explain how pressure gradients, viscosity, and vessel diameter affect blood flow in the body using fluid mechanics ideas.
• Describe how blood’s non-Newtonian behavior can change perfusion in small vessels.
• Predict how stenosis (narrowing) alters flow rate and pressure drop using simplified pipe-flow reasoning.+ Show more

Learning Objectives

• Explain how the rock cycle moves matter through the lithosphere, hydrosphere, and atmosphere.
• Identify key processes in the rock cycle: melting, cooling, weathering, deposition, and metamorphism.
• Describe how energy transfer is involved in each step of the rock cycle.+ Show more

Learning Objectives

• Explain how sustainable practices reduce impacts on Earth’s air, water, land, and ecosystems
• Identify key strategies for improving resource efficiency, reducing waste, and treating pollutants
• Use data-based reasoning to compare solutions that meet human needs while lowering harm+ Show more

Learning Objectives

• Define density as mass per unit volume and identify appropriate SI units.
• Use density comparisons to predict whether objects will float or sink in water.
• Explain relative density and specific gravity as comparisons to water.

Learning Objectives

• Explain how cell culture, stem cell differentiation, and tissue engineering work in clinical and research settings
• Identify common molecular markers and describe how scaffold interactions can support controlled differentiation
• Evaluate trade-offs and limitations, including ethical, safety, and regulatory considerations+ Show more

Learning Objectives

• Define mechanical efficiency and explain why real systems often use more input energy than predicted.
• Identify common mechanisms that cause efficiency losses, including frictional heating, sound emission, and material hysteresis.
• Describe practical ways to measure or estimate energy losses and explain design strategies that reduce them.

Learning Objectives

• Explain how the centre of gravity (CG) and centre of buoyancy (CB) affect whether a floating body returns upright.
• Describe the role of metacentric height (GM) in upright equilibrium and righting moments.
• Predict how loading and trim can increase or decrease stability and the risk of capsizing.

Learning Objectives

• Calculate density from mass and volume using appropriate units.
• Use displacement and overflow methods to determine the volume of irregular objects.
• Analyze measurement precision, uncertainty, and significant figures when reporting density.+ Show more

Learning Objectives

• Define pressure as force per unit area and identify its SI unit
• Differentiate between surface (contact) pressure and internal fluid pressure
• Use the relationship between newtons per square meter and kilopascals to convert units+ Show more

Learning Objectives

• Explain Pascal's principle and how pressure in a confined fluid is transmitted.
• Use the pressure idea to relate piston areas to force multiplication in hydraulic systems.
• Identify real-world hydraulic applications and describe key limitations (compressibility, seals, leaks).

Learning Objectives

• Explain how submarine ballast tanks change buoyancy by adjusting displaced volume and internal mass
• Identify conditions for neutral buoyancy and describe what happens when water is taken in or ejected
• Use simple calculations involving tank volume, fluid density, and net buoyant force to predict buoyancy changes+ Show more

Learning Objectives

• Explain how hydrostatic pressure depends on depth and how that leads to forces on submerged surfaces
• Determine net hydrostatic force and describe how the centre of pressure relates to resultant force location
• Analyze how hydrostatic load creates torque on structures such as dams and bulkheads

Learning Objectives

• Explain the main stages of the cell cycle, including interphase, mitosis, and cytokinesis
• Describe how DNA replication and chromosome segregation support accurate cell division
• Summarize the roles of cyclins, kinases, and checkpoint mechanisms in preventing genomic instability

Learning Objectives

• Explain the three core ideas of cell theory and what they mean for living organisms
• Describe how microscopy and modern imaging provide evidence for cell theory
• Connect the idea that cells arise from pre-existing cells to cell reproduction

Learning Objectives

• Compare plant and animal cells by identifying key structures and their functions
• Contrast prokaryotic and eukaryotic cell organization and explain how organization affects metabolism
• Explain how structural differences support ecological roles and physiological needs

Learning Objectives

• Explain how negative and positive feedback help maintain internal stability (homeostasis).
• Describe how cells and organ systems use sensors, control centers, and effectors to regulate variables at a set point.
• Use examples such as blood glucose regulation, thermoregulation, and osmoregulation to trace signal integration to bodily responses.