The era of "ancient life" is the ________ era
A) Mesozoic B) Paleozoic C) Cenozoic D) Precambrian
B
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As an air parcel aloft moves northward from the equator, it moves closer to the Earth's axis of rotation. According to the principle of conservation of angular momentum, which of the following statements explains the motion of the air parcel?
A. It increases in speed. B. It slows down and eventually reverses direction. C. It remains constant. D. It slows down but continues in the same direction.
Which of the following best describes the energy supply in the United States in 2015?
A) Coal is still the dominant fuel. B) Coal has largely been replaced by natural gas for energy supplies. C) Natural gas remains the dominant fuel in the United States. D) Coal and oil are the primary energy supply in the United States.
The polar cell
A. has low pressure centered over the poles resulting in stormy conditions. B. has low pressure centered over land in the northern hemisphere. C. has high pressure centered over land in the southern hemisphere. D. has surface winds out of the west, easterly winds aloft.
What factors are the most critical in determining whether a fossil is preserved?
A. The temperature of the granite and how fast it cooled. B. Whether the creature was a predator or was prey. C. The color of the original organism compared to the color of the sediments in which it is found. D. The age of the fossil and the age of sediments in which it is preserved. E. Whether the creature had hard parts and how fast it was buried.