What are the two primary reasons the earth is ‘just right' for life to thrive?
A. The earth's distance from the sun and the volume of its oceans
B. The surface area of the earth's continents and its distance from the sun
C. The size of the earth and the surface area of its continents
D. The size of the earth and its distance from the sun
E. The size of the earth and the volume of its oceans
Answer: D
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What was once an open pasture on a long-abandoned farm has changed over time, without the direct influence of humans. After the cattle had been removed, shrubs and bushes could be seen dotting the grass-covered hillsides
A few years later, small pine trees and then larger deciduous trees appeared. Now, there are so many trees and shaded regions that it is difficult to tell that this was once a field. The ecological changes in this abandoned pasture represent ________. A) primary succession B) secondary succession C) disturbances D) resilience events
Where do thunderstorms mostly occur?
A. in the midlatitudes over the oceans B. in the United States, along the Gulf coast C. in the tropics over the oceans D. in the United States, along the West coast E. in the poles over land surfaces
The size of leaching field a septic system requires is determined
A. solely on the permeability of the soil beneath the leach field. B. by the height of the water table. C. solely on the number of people served or volume of wastewater that is anticipated. D. based on both the number of people served or volume of wastewater anticipated and permeability of the soil.
Mid-ocean ridges are higher than surrounding oceanic crust primarily because
A. the lithosphere is thinner and hotter. B. transform faulting uplifts the rocks. C. two plates are colliding. D. the crust is thicker and stronger.