A geologist is looking at deposits along a river below a large volcano. She finds large boulders mixed with sand and mud, and all of the material is comprised of volcanic rocks, particularly the mud which is volcanic ash. She quickly realizes these deposits represent an ancient ________.
a. rock avalanche
b. lahar
c. slump
d. earthflow
b. lahar
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What is the difference between a joint and a fault?
A) A joint is formed by confining pressure. B) A joint is formed by differential stress but a fault is not. C) A fault is formed by tension, but a joint is formed by compression. D) A fault displaces the rocks on one side relative to another.
Seawalls can decrease biodiversity by narrowing beaches
Indicate whether the statement is true or false
Do connections between habitat patches actually increase their diversity? Evidence from current field research involving plants is determining that ________
A) yes, corridors connecting habitat patches do increase species diversity B) only if adequate fertilizers and pesticides are applied to the habitats C) no, corridors connecting habitat patches actually decrease diversity D) only if migrating animals and birds carry seeds between patches E) no, corridors connecting habitat patches have yet to make a difference
The United States leads the world in per capita carbon dioxide (CO2 ) emissions
Indicate whether the statement is true or false