Types of rocks.pdf
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This document describes three main types of rocks: igneous rocks which form from cooling lava in the mantle such as basalt and granite; sedimentary rocks which are formed from layers of deposited rock fragments and fossils such as limestone; and metamorphic rocks which change over thousands of years due to heat and pressure conditions, including slate.
Types of rocks.pdf
- 2. 1. Igneus rocks They come from lava in the mantle. The lava cools down and becomes solid.
- 3. Basalt and granite Granite is made of three minerals: quartz, feldespate and mica.
- 4. 2. Sedimentary rocks Fragments (little pieces of) rocks deposite and make layers. Sometimes, we can find fossils in these rocks.
- 6. 3. Metamorphic Rocks change because of heat and pressure. They need thousand of years to change.