Weathering and erosion

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 A rock cracks into pieces in place. What happened? Weathering Transport by erosion Melting

Question 2 A river carries rock particles away. What happened? Crystallization No movement Erosion

Question 3 Particles settle on a riverbed. What happened? Magnetism Deposition Melting

Question 4 Which change makes igneous rock? Cooling from molten material Moving a pebble Painting a rock

Question 5 Can color alone identify every rock? Yes, always Only on Fridays No, use several clues

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