A substance that cannot be broken down into other substances by ordinary chemical methods is a(n)
A. molecule
B. crystal
C. compound
D. element
Answer: D
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Ecologists study ____________________ in nature
Fill in the blanks with correct word
Which of the following statements is true about a swinging pendulum?
A) Its kinetic energy is greatest when it is vertical (at the midpoint of its swing). B) Its potential energy is greatest when it is vertical (at the midpoint of its swing). C) Its kinetic energy does not change as it swings. D) Its potential energy does not change as it swings.
The North Atlantic Current is an example of which of the following types of currents?
A) Eastern Boundary Current B) Equatorial Counter Current C) Northern Boundary Current D) Southern Boundary Current E) Western Boundary Current
Why is air pressure greatest at sea level?
A. Air pressure depends on the weight of overlying air molecules. B. Air pressure depends on the temperature of air and air near Earth's surface is warmest. C. Air pressure depends on the force with which air molecules strike Earth's surface; molecules near Earth's surface strike Earth with more force. D. Air pressure is inversely proportional to the density of air.