That the northern continents were once joined and located along the equator was shown by the:a
coal-age plant fossils of North America and Europe.
b. Glossopteris flora.
c. distribution of mountain ranges.
d. distributions of Permian and Triassic reptiles.
e. distributions of northern hemisphere glacial tillites.
A
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Why might increasing the concentration of a set of reactants increase the rate of reaction?
A. You have increased the ratio of reactants to products. B. You have increased the chances that any two reactant molecules will collide and react. C. The concentration of reactants is unrelated to the rate of reaction. D. The rate of reaction depends only on the mass of the atoms and therefore increases as you increase the mass of the reactants. E. none of the above
High volatile content would be most likely associated with:
a. rhyolitic magma b. basaltic magma c. gabbroic magma d. porphyritic magma
In the course of one day, a human experiences several dozen ecosystem services other than the essential provisioning services supplying us with food, water, and the air we breathe. Explain three additional ecosystem services that are essential to
maintaining life on Earth. What will be an ideal response?
Earth's six principal subsystems are ____________________, ____________________,
____________________, ____________________, ____________________, and ____________________. Fill in the blank(s) with the appropriate word(s).