One important relationship between chemical and mechanical weathering is ________.
a. mechanical weathering can produce smaller pieces of rock that have more surface area for chemical weathering to work on.
b. chemical weathering can produce smaller pieces of rock that can then be modified by mechanical weathering
a. mechanical weathering can produce smaller pieces of rock that have more surface area for chemical weathering to work on.
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Evidence from proxies indicate eight major oscillations in global temperatures over the past 800,000 years, most likely the result of:
A) rising and falling sea levels that greatly impact photosynthetic activity.
B) variations in solar activity that produce different levels of radiation.
C) Milankovitch cycles of periodic variations in Earth's orbits around the sun.
D) lunar cycles in which the moon orbits at different distances from the Earth.
Tropical cyclones
A) usually form at the equator. B) are strongest when they form over very warm waters. C) need cold ocean currents to trigger their formation. D) usually travel from west to east. E) are most common in the northern Pacific.
Rainforests occupy approximately ________ of the world's land area, but represent about ________ of Earth's species
A) 7%; 50% B) 10%; 35% C) 2%; 12% D) 12%; 65%
During the tornado outbreak of 14-16 April 2011, Alabama reported the most tornado-related deaths.
Answer the following statement true (T) or false (F)