Communications and weather satellites always appear at the same place in the sky. This is because these satellites are
A) beyond the pull of Earth's gravitational field.
B) moving at a speed just short of escape velocity.
C) orbiting Earth with a 24-hour period.
D) stationary in space.
E) none of the above
C
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What is the statistical recurrence interval for a flood of rank 2 in a data set that is 99 years long?
a. on average, once every 10 years b. on average, once every 20 years c. on average, once every 30 years d. on average, once every 40 years e. on average, once every 50 years
Which of the following will have the highest electrical conductivity?
A) 0.1 M NaCl B) 0.2 M NaCl C) 0.3 M NaC2H3O2 D) 0.4 M NaC2H3O2
The energy that drives the hydrologic cycle comes from the _______________
Fill in the blank(s) with correct word
Some scientists suggest we can increase the amount of carbon dioxide removed from the atmosphere by adding ________ to stimulate productivity in tropical oceans
A) calcium B) carbon C) iron D) magnesium E) manganese