1. Earth has left over heat from its formation billions of years ago. a. True b.
ID: 304884 • Letter: 1
Question
1. Earth has left over heat from its formation billions of years ago. a. True b. False
2. The higher the silica content of the magma, the less viscous it is. a. True b. False
3. When hiking down most shield volcanoes, which rock composition(s) will you see from its base to its summit? a. Felsic at the bottom, intermediate in the middle, and mafic at the top b. Mafic at the bottom, intermediate in the middle, and felsic at the top c. Intermediate from bottom to top d. Mafic from bottom to top
4. When a mass of material moves downslope under the influence of gravity, the process is called: a. Mass wasting b. Rockslide c. Slump d. Mudflow
5. A rock fall is a type of mass wasting. a. True b. False
Explanation / Answer
Answer 1: True. Earth has two main internal sources for its heat – radioactive decay in its internal composition and remnant heat from the formation of the earth 4.5 billion years ago!
Answer 2: False. The higher the silica content of the magma, the more viscous it is. On the basis of its composition, magma is classified into two- mafic (rich in Mg, Fe) and felsic (rich in silica and feldspar).
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