1. sea levels rise and lower when
form and break up over time.
2. the first mammals did not appear on land until near the end of the
3. the first four-legged animals to reach land were classified as
4. pangea was fully formed during the late period.
respond to the following based on your reading.
5. briefly explain the causes of glaciation and the processes that cause glaciers to grow.
6. briefly explain how changes in sea level and evidence of past marine life are related.

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not sure if this what   you'r looking for would be percent composition

answer and explanation;

volcanic rocks are igneous rocks which form from lava, molten rock which has been thrust out of a volcano onto the surface of a rocky body such as an asteroid, planet, or dwarf planet.  

plutonic rocks are igneous rocks which form from subterranean chambers of molten rock or magma. plutonic rocks make up the base of continental crust as well as oceanic crust. their slow rate of formation causes them to be coarse grained since there is plenty of time for large crystals to form before the magma solidifies into rock.

the textural difference is that plutonic rocks are more coarse grained than volcanic rocks. plutonic rocks are coarse grained while volcanic are fine grained ; glassey or fragmental. since fine and coarse are adjectives the decision as to whether a rock is fine or coarse grained is generally made on the bases of whether or not the individual crystals can be seen in most if the rock.