What is considered to be the densest type of crust?
a. Basalt
b. Continental crust
c. Granite
d. Andesite
ANS: A
The oceanic crust is denser in comparison to continental crust. The oceanic crust is mainly composed
of basalt which is a heavy, dark colored rock. It contains oxygen, silicon, magnesium, and iron.
Information can be found in the section Earth's Inner Structure Was Gradually Revealed.
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Why is dacite considered a fine-grained rock felsic rock?
A) It contains very little silica. B) It contains a lot of silica and feldspar. C) It contains a lot of iron and magnesium. D) It contains an intermediate amount of silica.
What occurs during cementation?
A) Additional layers of sediment accumulate and press down on the layers underneath them. B) Sediment is heated up, causing them to cement together. C) Minerals precipitate from water in the pore spaces between sediment particles and cement them together into rock. D) Sediment crystallizes, causing them to cement together.
The reduction of government controls of economic activity within a country is called privatization
Indicate whether the statement is true or false
The fact that Earth's interior is sorted into layers indicates that
A) Earth was once in a molten state, during which materials became sorted based on density. B) the rotation of the early Earth acted like a centrifuge which separated materials based on weight. C) the process of formation from a nebula (by the slamming together of material and planetesimals that stuck together on impact) produces nice, neat layers. D) nothing can be inferred about such a perplexing level of organization.