Dolostone (dolomite) often forms from limestone.
Answer the following statement true (T) or false (F)
True
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The beginning of the Cambrian period marks an important event in animal evolution — the appearance of organisms with ________.
A) wings B) cells C) hard parts D) vertebrae E) none of the above
Antarctica ______________.
a. is owned by the United Nations. b. has been carved like a territorial pie into claims by various states. c. has a small but thriving native population. d. is the coldest place in the Northern Hemisphere.
In which of the following time periods were dinosaurs the dominant creatures?
A. Mesozoic B. Precambrian C. Cenozoic D. Paleozoic
Which of the following best explains why there is a difference between a lunar day and a solar day?
A) During one Earth rotation, the Moon has continued orbiting Earth. B) The Moon must rotate an additional 50 minutes to catch up to Earth. C) The solar day and lunar day are measured from different meridians. D) The Sun has a stronger pull on the larger Earth versus the smaller Moon. E) The tide-generating forces of the Sun and Moon are working at right angles.