Classifying Rocks by Formation
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Objective
I can classify rocks based on their formation.
Part 1 of 4
Warm-up video
MooMooMath and Science · 5:15
We don't generate video — this one is by MooMooMath and Science on YouTube. The practice questions and exit ticket below were drafted by AI for this objective, and every question is editable in the teacher guide.
Part 2 of 4
Key concepts
3 concepts
- 1
Igneous rocks are formed from hot molten rock that cools and solidifies from either magma or lava.
- 2
Extrusive igneous rocks form on the surface, cool quickly, and have small or no crystals, while intrusive rocks form inside the Earth, cool slowly, and have larger crystals.
- 3
Igneous rocks can be classified as either mafic, which are dark in color and contain magnesium and iron, or felsic, which are lighter and contain feldspar and silica.
Part 3 of 4
Practice
3 questions
Igneous rocks are classified based on their formation. What are the two main types of igneous rocks based on their formation environment?
Explain how the cooling rate affects the crystal size and texture of igneous rocks. Provide examples of rocks with different crystal sizes.
Part 4 of 4
Exit ticket
Quick comprehension check
“Describe how intrusive and extrusive igneous rocks are formed, and list two differences between them.”
Sample answer included in the free materials
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