|
There are
three types of rock: |
| |
| 1. Igneous: these are rocks that solidified
directly from molten silicates, which geologists call magma.
Examples are: granite, basalt, pumice and flint (which is a form
of quartz). |
| |
| 2. Sedimentary: these are formed when igneous
rocks are eroded as a sediment under the sea. Fossils are often
found in this layer. Examples are limestone, chalk, sandstone. |
| |
| 3. Metamorphic: these are made up of igneous and
sedimentary rocks of all ages which have been subjected to intense
pressure. Examples are: slate, marble, quartzite. |
| |
