A rock that has both gas bubbles and fossils is likely to be a __________________________ rock. Group of answer choices Igneous intrusive Igneous extrusive Sedimentary Metamorphic
Igneous rock
Igneous rock is formed from the cooling of magma either above the surface or below it. The rock which is formed above the surface is called an extrusive igneous rock and that which is formed below the surface is called an intrusive igneous rock.
Igneous rocks are characterised by
- interlocking grain texture
- absence of fossils
- absence of bedding and layerings
Metamorphic rocks- Metamorphic rocks are solid state transformation of igneous and sedimentary rock when exposed to change in temperature and pressure.
Metamorphism starts at 150 °C. The change in temperature and pressure causes the rock to change into solid form and a new rock form with completely new composition. Metamorphic rocks are also characterized by absence of fossils and beddings.
Sedimentary rock-
Sedimentary rocks are formed due to the deposition of the eroded grains from the pre-existing rocks. They first deposited and then lithified into sedimentary rock.
They show clastic texture. and are characterised by
- fossil
- beddings and layerings
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