Orogens are belts of igneous and metamorphic rocks formed by the collisions of cratons
a. True
b. False
True
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What does the following element description actually mean?hydrogen-2
A. two hydrogen atoms B. a hydrogen with two protons C. a hydrogen with one neutron and one proton D. a hydrogen with two neutrons E. a molecule of hydrogen gas
An important natural source of which of the following chemicals comes from volcanoes?
A. ozone B. benzene C. carbon monoxide D. sulphur dioxide
Of all the threats to biodiversity, the single greatest threat is ________
A) invasive species B) overharvesting species C) habitat destruction D) habitat fragmentation E) pollution
What is firn?
A. A deposit of debris at the toe of a glacier B. A deposit of debris at the side of a glacier C. The transitional phase between snow and glacial ice D. A crack in a glacier E. Pieces of ice that break off into a body of water