What three components make up most magmas?

A) Silicon, potassium feldspar, and muscovite
B) Water, melted rock, and solid crystals
C) Lava, ash, and gas
D) Liquid portion, solid portion, gaseous portion


Answer: D

Environmental & Atmospheric Sciences

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Food security has to do with

A. A country's dependence on cash crop exports. B. Preventing wars over diminishing food supplies. C. The total volume of food a country imports. D. The total volume of aid a country receives. E. The ability of a population to obtain food on a day-to-day basis.

Environmental & Atmospheric Sciences

The salts in the ocean are similar to those of concentrated river water

a. True b. False

Environmental & Atmospheric Sciences

The United States imports some minerals of which it has ample supplies and production exceeding current demands.

Answer the following statement true (T) or false (F)

Environmental & Atmospheric Sciences

For the geographer, domestication involves taming and training animals, but not the planting and harvesting of crops

Indicate whether the statement is true or false.

Environmental & Atmospheric Sciences