Igneous rocks and cooling history are the focus of this Grade 4 Science resource, helping students connect how magma and lava cool with the characteristics and history of igneous rocks. Designed for an Ontario science context, the worksheet explores formation, cooling rate, crystal size, texture, mineral content, and the movement of igneous rock material through geological processes.

Explore how cooling shapes igneous rocks

Students describe how igneous rocks form from magma or lava and compare intrusive and extrusive igneous bodies. They examine how cooling rate affects crystal size and use igneous texture and mineral content to infer a rock's cooling history and geological setting.

The resource also connects igneous rocks to the wider rock cycle by examining how weathering can produce sediments that contribute to the formation of other rock types. This gives students a clear opportunity to connect rock formation with subsequent geological change.

Skills and question types

Students work through multiple-choice questions, true-or-false statements, short-answer responses, a reading passage, matching, a cloze passage, an essay, and a “Did You Know?” feature. The activities ask students to distinguish intrusive from extrusive settings, relate cooling rate to crystal size, interpret igneous texture and mineral content, and explain how weathering changes rock material into sediment.

Included teaching support

• Student worksheet covering igneous rock formation, cooling history, texture, mineral content, and weathering
• Student Notes & Lesson Summary supplement for reinforcing the concepts addressed in the lesson
• Separate Teacher Guide PDF with learning objectives, teaching tips, discussion questions, and common mistakes

Use it within a rocks and minerals unit

This igneous rocks worksheet can be used during instruction on rocks, minerals, and geological processes, as independent classroom practice after teaching, or as a review activity. The student notes provide a useful reference alongside the worksheet, while the Teacher Guide gives educators practical prompts for discussion and preparation.

For Grade 4 Science instruction, the resource keeps students focused on observable relationships: how magma or lava forms igneous rock, how cooling conditions influence crystal size and texture, and how mineral content can provide clues about a rock's history and setting. The connection to weathering extends the lesson beyond formation and helps place igneous rocks within broader geological change.