What are the three main categories of rocks, classified by their formation?

• Sandstone, Limestone, Shale

• Igneous, Metamorphic, Sedimentary

• Granite, Basalt, Pumice

• Coal, Mudstone, Quartz

How is sedimentary rock primarily formed?

• By extreme heat melting and then cooling molten rock.

• By layers of rock and dirt being squeezed together under immense pressure over a long time.

• By chemical changes due to heat and pressure from nearby magma.

• By volcanic eruptions and rapid cooling of lava.

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What two main factors contribute to the formation of metamorphic rock?

• Wind and rain erosion.

• Melting and hardening of molten rock.

• Extreme heat and immense pressure.

• Water and chemical reactions.

How is igneous rock formed?

• When tiny pieces of rock and dirt are compacted over time.

• When existing rocks are chemically changed by heat and pressure.

• When molten rock cools down and hardens.

• Through the erosion and deposition of sediments.