The tangential velocity of an Earth satellite in circular orbit is its velocity
A. in any direction.
B. parallel to Earth's surface.
C. perpendicular to Earth's surface.
D. not enough information
Answer: B
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Aquatic ____________________ is determined by environmental factors including temperature, sunlight, dissolved oxygen, and available nutrients.
Fill in the blank(s) with the appropriate word(s).
Thunder is caused by ____
A) the collision between two thunderstorms with opposite electrical charge B) the rapid heating of air surrounding a lightning channel C) the explosion that occurs when + and - charge collide and neutralize each other D) turbulent wind motions inside the thunderstorm
In the present day, what is the most valuable non-living commodity obtained from sea floor?
A) oil and gas B) sand and gravel C) gas hydrate D) gold
Humid middle-latitude climates with mild winters tend to have less precipitation in the summer than during the rest of the year because ________
A) oceanic subtropical highs migrate toward the equator during the summer. B) higher temperatures in those regions carry the moist air higher into the atmosphere. C) higher temperatures in those regions result in more precipitation over the oceans and less over the land. D) oceanic subtropical highs migrate poleward during the summer.