Human impact on desert areas is mainly due to which one of the following factors?
A. roads and highways
B. introduction of alien species
C. transport of water to deserts
D. None of these statements correct.
Answer: C
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The International Basel Convention bans the transfer of hazardous waste from developed to developing countries. The United States
a. is the only industrialized nation that has not ratified this convention b. has enthusiastically embraced this convention c. is the author of this convention d. has revised and improved this convention e. none of these answers
_________________ from industrialization has caused extensive damage to forests and fish populations in northern Europe.
-Acid rain -Wealth -none of these is correct -New technologies -Population growth
The movement of a substance in solution from an area of higher concentration to an area of lower concentration across a selectively permeable membrane in a living organism is called ________
A) active transport B) Brownian movement C) diffusion D) osmosis E) passive transport
What are the rounded hills inside the Valles Caldera?
A) Volcanic necks
B) Landslides
C) Volcanic domes
D) Cinder cones