2. What are alternative terms used in place of “extrusive” and “intrusive” igneo
ID: 285715 • Letter: 2
Question
2. What are alternative terms used in place of “extrusive” and “intrusive” igneous rock?
A. Magma and granite
B. Pumice and lava
C. Volcanic and plutonic
D. Vesicular and plutonic
2. What are alternative terms used in place of “extrusive” and “intrusive” igneous rock?
A. Magma and granite
B. Pumice and lava
C. Volcanic and plutonic
D. Vesicular and plutonic
Note: I have experienced intermittent problems accessing the website used to answer #3. You may use the graphic below to answer this question if you encounter this issue.
3. During the Devonian Period, where is North America located relative to the Equator? (Hint: if using the website to answer this question, go to “Close-up: Phanerozoic Eon,” then click on Devonian in the time scale image.)
A. Predominately east of the equator
B. Predominately west of the equator
C. Predominately north of the equator
D. Predominately south of the equator
Explanation / Answer
2. The alternative terms used in place of 'extrusive' and 'intrusive' rocks are volcanic and plutonic.
Extrusive or volcanic rocks are the rocks that are formed by eruption from a volcano. This rocks are fine-grained due to less time of cooling and crystallisation. On the other hand, plutonic or intrusive rocks are formed from slowly cooling magma below the Earth's surface. Thus, plutonic rocks are coarse-grained.
3. During the Devonian period, North America was located predominantly west of the equator.
During Palaeozoic time, North america, Greenland and Europe were united to form a single Northern Hemisphere. This is also called Laurussia. On the other hand, South America, Africa, India, Australia and Antarctica were united and formed the Gondwanaland. At that time the equator or paleoequator passed through the North America and China.
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