If a superposed stream erodes downward into resistant rock and cuts narrow canyons, the resulting

feature is called a(n) ____________________. Fill in the blank(s) with the appropriate word(s).


water gap

Environmental & Atmospheric Sciences

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Proposed the concept of natural selection:a

Hutton d. Werner b. William Smith e. Wegener c. Darwin

Environmental & Atmospheric Sciences

Purple martins are the largest species of swallow in North America

In the Eastern United States, they breed almost exclusively in large colonies in artificial martin houses and hollowed-out gourds hung by martin enthusiasts, who often have to remove invasive house sparrows from these artificial nest sites in order for the martins to have a place to nest. The relationship between the martins and sparrows can best be described as ________, and the relationship between the martins and the martin enthusiasts can best be described as ________. A) predation; mutualism B) intraspecific competition; interspecific competition C) parasitism; symbiosis D) interspecific competition; mutualism

Environmental & Atmospheric Sciences

What is the process of wave separation?

A) Swells B) Wave trains C) Fully developed sea D) Dispersion

Environmental & Atmospheric Sciences

Which statement about cones of depression is true?

A)They form when water inflow exceeds water withdrawal. B)They affect large regions and have extensive economic impact. C)They lower the water table around a well. D)They only form immediately after a well is drilled. E)They get narrower closer to the well head.

Environmental & Atmospheric Sciences