Science: rocks
Terms
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- igneous rock are classified according to -
- their origin, texture and mineral composition
- texture
- the look and feel of a rock's surface
- metamorphic rock forms when -
- an existing rock is changed by heat, pressure or chemical reaction
- grains
- particles of minerals or other rocks that give rock its texture
- igneous rock: origin
- igneous rock forms on or beneath the Earth's surface
- 3 major groups of rocks
- 1. igneous / 2. sedimentary / 3. metamorphic
- granite
- is the most popular and easily found intrusive rock
- extrusive rock
- igneous rock formed from lava that erupted onto the Earth's surface
- texture of a rock is classified based on -
- 1. grain size / 2. grain shape / 3. grain pattern
- intrusive rock
- igneous rock that forms when magma hardens beneath the Earth's surface
- sedimentary rock forms when -
- particles of other rocks or remains of plants and animals are pressed and cemented together
- igneous rock forms from -
- cooling magma or lava
- basalt
- is the most common extrusive rock, it forms most of the Earth's crust