What is the difference between "magma" and "lava"?
A) Magma is less dense than lava.
B) It is just a name change, and lava is what magma is called if it reaches the surface of the Earth.
C) Magma makes igneous rocks and lava forms volcanoes.
D) Magma is formed deep in the Earth and lava forms near the surface of the Earth.
B
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____________________ are essential portions of watersheds because they serve as the liaison between land and water resources.
Fill in the blank(s) with the appropriate word(s).
Which of the following is true of all combustion reactions?
A) They are endothermic. B) They produce carbon dioxide. C) both a and b D) neither a nor b
Physically, Africa can be characterized as very flat, low elevation, and dominated by a large coastal plain
Indicate whether the statement is true or false
Which of the following ocean currents is critical in maintaining the average winter temperatures in Great Britain and Norway, and keeping them from being much colder?
A. North Atlantic Drift B. North Equatorial Current C. Canary Current D. Labrador Current