Does a shell have to contain electrons in order to exist?
A. A shell is a form of energy that requires electrons in order to exist.
B. A shell is just a conceptual model; hence, it doesn't really exist with or without the electron.
C. A shell is just a region of space which may or may not contain electrons.
D. Two of the above are reasonable answers.
Answer: D
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Which of the following is not an anthropogenic biome?
A) residential rangelands B) populated forest C) pastoral village D) boreal and montane forest
Vegetation decreases runoff by
A) reflecting only the green portion of sunlight B) absorbing water into leaves C) intercepting rainfall and slowing its fall to the ground D) holding soil in place
Because of the challenges associated with removing oil from the ground,
A) the first oil removed from a well is the most expensive to extract. B) primary recovery of oil is more expensive than secondary recovery. C) enhanced recovery of oil is more expensive than secondary recovery. D) only about 60% of the oil in a well can be removed by just pumping.
Which type of magma produces lava flows which travel the fastest and farthest?
A. Granite B. Rhyolite C. Andesite D. Basalt