Three rock families

Follow the clues that show how rocks form and change.

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Igneous rock forms when molten material cools. Sedimentary rock can form from sediments that become compacted and cemented. Metamorphic rock changes through heat and pressure without melting. The rock cycle has many paths.

Worked example

Sand grains become sandstone through compaction and cementation. If rock melts and later cools, the new rock is igneous.

Three labeled rock types linked by cooling, sediment formation, and heat and pressure, with no single compulsory starting point.

Would you believe it?

Some pumice can float! Gas-filled spaces can make this volcanic rock less dense overall than water.

USGS: rocks that float

Question 1 Molten rock cools and becomes solid. Which family? Igneous Sedimentary Metamorphic

Question 2 Sand grains are compacted and cemented. Which family? Igneous A cloud Sedimentary

Question 3 Rock changes under heat and pressure without melting. Which family? Igneous only Metamorphic Liquid

Question 4 Which clue is safer to observe first? Grain size and layers How it tastes Whether it burns indoors

Question 5 Must a rock follow one fixed cycle? Yes, always three steps Only at night No, there are different paths

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