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1. igneous rocks: formed by the cooling and hardening of magma (molten rock) from inside Earth. 2. sedimentary rocks: formed by the compaction and cementing of layers of sediment (rock fragments, plant and animal remains, minerals from water) 3. metamorphic rocks: formed by the effect of heat and pressure on other rocks. *Earthâs crust is made-up primarily of igneous rocks.
Lecture 15 - Sedimentary rocks and Geologic Time Lisa Tauxe Introduction. You may have noticed that things left outside tend to change; they rust, crack, peel, shrink, wrinkle, and fade, and ultimately fall apart. This happens to rocks exposed to the rain and sun as well. They crack, rust, peel and ultimately fall apart. (I haven't noticed that they shrink, wrinkle, and fade, though). When they fall apart, they become what geologists call regolith.