| A | B |
|---|
| rock-forming minerals | the 20 minerals that make up most of the rocks of Earth's crust |
| granite | a usually light-colored igneous rock, the most common intrusive igneous rock |
| basalt | a dark-colored igneous rock, the most common extrusive igneous rock |
| grains | particles of minerals and other rocks that make up a rock |
| texture | the look and feel of a rock's surface |
| igneous rock | rock that forms from the cooling of magma or lava |
| sedimentary rock | rock that forms when particles of other rocks or the remains of plants and animals are pressed and cemented together |
| metamorphic rock | rock that forms when an existing rock is changed by heat, pressure or chemical reactions |
| extrusive rock | igneous rock fromed from lava that erupted onto Earth's surface |
| intrusive rock | igneous rock that formed when magma hardened beneath Earth's surface |
| silica | a material formed from oxygen and silicon that is contained in most of Earth's minerals |
