The war between North and South Vietnam ended in ________, leading to the unification of the two countries as Vietnam.
A. 1954
B. 1965
C. 1970
D. 1975
D. 1975
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Which of the following are solar energy technologies?
A. solar cookers, passive solar heating systems, and translucent solar film B. solar cookers, photovoltaic cells, and active solar heating systems C. translucent solar film, solar cookers, and power towers D. photovoltaic cells, active solar heating systems, and reactive electrosolar systems E. reactive electrosolar systems, solar cookers, and passive solar heating systems
Ninety-eight percent of the earth's crust is composed of only ________ elements.
A. 5 B. 17 C. 23 D. 8
Soil formation is a slow process that takes place very gradually over thousands of years
Indicate whether the statement is true or false.
Which of the following must have occurred in order for the inner planets to grow?
A) explosions in the Sun B) solar wind blasted gases out of the nebula C) temperatures cooled throughout the nebula D) dust was delivered to the nebula by asteroids and meteors