So, how could a rock “change form”?
(a) Examine the igneous rocks, granite, in the picture.
How might these rocks look different after changing form?
(b) Explain what processes on Earth may cause the rocks to change form.
Rocks make up the majority of the Earth's crust. One of the most common rock is granite. The four minerals that make up granite are feldspar, quartz, mica, and hornblende. Granite was formed when magma cooled slowly forming crystals of the four minerals that make up the rock granite. Most of the Earth's surface rocks are covered by soil or clay. Soil contains very small crushed pieces of rock and organic (plant and animal remains) material. Plants such as grass and trees grow in this region of the crust.
