1. How does lava differ from magma? 2. How does the rate of cooling influence th

Question

1. How does lava differ from magma?

2. How does the rate of cooling influence the crystallization process?

3. Is it possible for two igneous rocks to have the same mineral composition but be different rocks? Use an example to support your answer.

4. The classification of igneous rocks is based largely on two criteria. Name these criteria.

5. During a geology field trip you observe an exposure of rock with a basalt layer sandwiched between a sandstone and a shale bed (both sedimentary rocks). The basalt is fine-grained with abundant vesicles along its upper margin. A fellow student suggests that the basalt layer is a fine-grained intrusive body of igneous rock called a sill. You disagree and argue that it is actually a lava flow. What allowed you to distinguish between a basaltic flow and a basaltic intrusion?

6. Describe the formation of a Crater Lake, a volcanic landform found in Oregon.

7. Name two composite cones. How would you characterize a typical eruption for one of these volcanoes - would it be explosive or quiescent? Why do these volcanoes erupt in this fashion?

Explanation / Answer

Answer for question no.1

Difference between Lava and magma

Magma: It is molten rock lies beneath the earth surface and stored in earth's crust.(simply molten rock lies below the earth surface)

Lava: It is also molten rock but magma comes out to earth surface through volcanoes is known as lava (simply molten rock lies above the earth surface)

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