A mass of falling and tumbling rock, debris, and soil leveling at a high velocity owing to the presence of ice or water is a
A) debris avalanche.
B) creep.
C) rockfall.
D) landslide.
E) mudflow.
A
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The presence of ____________ gases in our atmosphere creates natural, life-sustaining heat on Earth.
Fill in the blank(s) with the appropriate word(s).
Social area analysis attempts to explain
A) the changing location of retail and office activities in North American cities. B) the development of squatter settlements in developing countries. C) the distribution of different types of people in an urban area. D) which of the three models of urban structure is the most accurate in the United States. E) regions ideal for social services.
What is the class of vertebrates who have a skeleton made of cartilage?
a. Osteichthyes b. Chondrichthyes c. Reptilia d. OphiuroidsOphiuroids e. Myxiniformes
The present-day tilt of Earth's axis of rotation is 23.5ยบ. What would be the result of less tilt, as shown here?
A. more hours of sunlight on the equator, resulting in warmer global temperatures B. high latitudes would receive less direct sunlight during the summer, causing cooler temperatures C. a decrease in glaciers D. All of these choices are correct.