In developing countries, pressure to increase agricultural productivity has resulted in
A) increased yields.
B) more sustainable use of the land.
C) conversion of forests into agricultural fields.
D) reduced use of hybrid crops.
C
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Informal sector employment, housing and transportation is, increasingly, acknowledged to be a rational response to poverty
Indicate whether this statement is true or false.
When the lithosphere and biosphere interact,
A) plants remove nutrients from the soil but return few if any nutrients to the soil. B) plants return nutrients to the soil but remove few if any nutrients from the soil. C) plants remove nutrients from the soil and return nutrients to the soil. D) plants acquire their nutrients directly from the air so that they do not disturb the nutrient structure in the soil.
Answer the following statement(s) true (T) or false (F)
1. The addition of Spain and Portugal to the EU increased Northern Africa's exports to that region 2. The water resources of the Nile Valley are finite. 3. The most important civil conflict in Sudan is between Muslims in the North and Jews in the South. 4. In the future, water may surpass oil as the critical resources in Southwestern Asia. 5. Most of Saudi Arabia's 7.5 million foreign visitors are tourists.
Why are most asteroids not spherical?
A. Strong magnetic fields in their molten core make them lumpy. B. Their gravity is too weak to pull them into a sphere and they have been fragmented by impacts. C. The Sun's gravity distorts them. D. The statement is false. Nearly all asteroids are spherical.