61.
Much of Tibet lies at altitudes over 18,000 feet where the pressure is about 500 mb. At such altitudes, the Tibetans are above roughly:

62.
Mobile combustion accounts

63.
The range of normal human hearing is in the range of

64.
At which temperature would the earth be radiating energy at the greatest rate or intensity?

65.
The ocean covers ________ percentage of Earth's surface.

67.
The air temperature is 45o F, the wind is blowing at 30 MPH, and the wind chill temperature is 15o F. These conditions would be equivalent to:

68.
Which of the following statements regarding species interdependence are true?
A. An association of two species where one is benefitted and other remains unaffected called mutualism
B. An interspecific association where both partners derive benefit from each other is called commensalism
C. A direct food relation between two species of animals in which one animals kills and feed on another is referred as predation
D. A relationship between two species of organism where both the partners are benefitted from each other is called symbiosis

69.
Where cold surface air replaces warm air, the boundary separating the different bodies of air is:

70.
What is meant by root zone process?