Which mineral property is the least reliable for identifying a mineral?
A. streak
B. cleavage
C. luster
D. crystal form
E. color
Answer: E
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During the Silurian, the collision of Gondwana and Laurentia produced the large landmass of
Laurasia. Indicate whether the statement is true or false.
With all of the sun's energy striking the Earth every second of every day, why doesn't the Earth overheat and kill all life living on it?
A) The Earth is so large and dense that it absorbs all of this heat.
B) The Earth is overheating regionally, melting rocks into the lava of volcanoes.
C) The Earth maintains a balance by radiating this heat back into space.
D) The atmosphere of the Earth prevents the solar radiation from reaching the Earth's surface.
What is a diagnostic characteristic of a mineral used to make a cement slab in your house?
A. it has a hardness of 1 B. it reacts with dilute hydrochloric acid C. it is magnetic D. it has one main direction of cleavage E. it has a hardness of 7
The Long-Term Ecological Research sites (LTER) collectively focus on studying
A) natural successional changes in ecosystems. B) the effects of various types of human disturbances to ecosystem function. C) how to make invasive species profitable for agriculture. D) the creation of artificial soils for ecosystems lacking producers.