The greenhouse effect involves warming of earth's surface and the
a. ionosphere
b. mesosphere
c. troposphere
d. stratosphere
e. thermosphere

Why is the price of rice so important? a. rice prices must be kept within reach of the poorest peopleb. rice prices must make a large profit or no one will grow itc. rice prices impact the cost of fruits and vegetables on neighboring farmsb. rice prices have no real importance other than to large corporations

Many feel that the u.s. should not give money to the world bank to aid people in other countries. true or false

Name two factors that, "power of magnetic field " of earth.