What causes an asteroid to drop out of orbit and travel toward Earth?
a. the gravitational influence of planets
b. the gravitational attraction of the sun
c. a change in magnetic characteristics due to its age
d. only the collision with another asteroid.
e. the slow loss of water, causing a change in path
ANSWER: a
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The ____________________ suggests that, on average, loss of 90% of the habitat in an area causes extinction of about 50% of the species in that area.
Fill in the blank(s) with the appropriate word(s).
Explain why the disposal of hazardous waste is especially difficult
What will be an ideal response?
Roughly ___% of US citizens live in coastal counties and are thus vulnerable to rises in sea level
a. 10 b. 50 c. 83 d. 95
Which of the following best describes the Electrolysis Method for desalination?
A) A current is run through positive and negative electrodes in freshwater separated by semipermeable membranes from seawater. B) Large icebergs are brought to coastal waters off countries that need freshwater where they are melted. C) Saltwater is boiled and the water vapor is passed through a cooling condenser, where it condenses as freshwater. D) Seawater is frozen and thawed multiple times, with the salts washed from the ice between each thawing. E) Water on the salty side of a semipermeable membrane is pushed under high pressure through the membrane to the freshwater side.