Over a period of time, a slowly crystallizing magma liquid develops a higher silica content while magnesium abundance decreases through fractional crystallization
Do the minerals crystallizing from the magma contain more silica relative to the starting magma or do they contain more magnesium relative to the starting magma?
a) The minerals contain more Si than the magma liquid
b) The minerals contain more Mg than the magma liquid
B
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About how many people die each year because of indoor and outdoor air pollution worldwide?
A. 10,000 B. 70,000 C. 500,000 D. 1 million E. 7 million
Which of the following examples of non-point source pollution cannot legally be dumped anywhere in the ocean?
a) glass b) rags c) dunnage (lining and packing materials that float) d) plastic e) all of the above cannot legally be dumped anywhere in the ocean
Which of the following statements describes how individual cloud elements usually appear when clouds are viewed near the horizon?
A. They appear closer together than is actually the case. B. They appear darker in colour than is actually the case. C. They appear lighter in colour than is actually the case. D. They appear farther apart than is actually the case.
A type of coasts that develops due to sediment deposition at the mouth of a river is called a delta coast
Indicate whether the statement is true or false