Which of the following is the best indication that limestone caves could be present at depth?
A) Springs
B) Cliffs and overhangs along rivers
C) Large quartz crystals laying on the surface
D) Gently sloping hills
E) Limestone pillars and sinkholes
E) Limestone pillars and sinkholes
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Although unusually high, extinction rates may be
A) declining because of overestimates of some groups in some ecosystems. B) declining because fewer species are becoming threatened worldwide. C) even higher because of the loss of tropical forests. D) even higher because of intense predation in many grassland ecosystems.
Which of the following rocks has a high modulus ratio?
a. marble b. quartzite c. slate d. gneiss
Why does the beach slope under water become steeper near shore?
a. The sand grains are finer near shore. b. The bottom has to rise rapidly to merge with the sand of the barrier island. c. Sand from the onshore part of the beach has to drop abruptly because offshore the sand is under water. d. Waves in shallow water drag on the bottom, so they lose energy and need a steeper slope to move the sand. e. The waves are bigger near shore.
The _______________ is used as the starting point for measuring latitude
Fill in the blank(s) with correct word