According to Milankovitch theory:
a. the theory of plate tectonics explains most of the recent global warming
b. variations in the earth's orbit characteristics change the amount of solar radiation received at the earth's surface.
c. negative feedback mechanisms exactly counteract positive feedback mechanisms.
d. All of these choices.
b
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Tree-ring dating, or dendrochronology, is a relative dating method
a. True b. False
Streams in mountainous areas normally have floodplains. Indicate whether the statement is true or false
Most of the 40 deadliest disasters between 1970 and 2013 occurred in a belt running from China and Bangladesh through India and Iran to Turkey. This area was particularly vulnerable because ________.
A. lightning producing thunderstorms are more common in these regions B. fires are more common in these regions C. it has a high population density D. precipitation rates are very high in this region, producing frequent, large, and sudden floods E. most of the world's earthquakes and volcanic eruptions occur here
Climate change and human activity like overgrazing of grasslands is leading to large areas subject to "desertification" where native grass cover dies out during drought periods, exposing soil to erosion
What is potentially the greatest initial soil erosion potential during this type of an event? A) local gullying produced by intermittent rain storms B) loss of topsoil by wind erosion on a large scale C) sand blown in from adjacent deserts D) growth of shrubs shading the ground, further killing the grasses