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The primary stream fed by tributaries within a dendritic drainage network is termed a ________ stream.

The Wadati-Benioff zone extends down within the mantle to a maximum depth of ________.

Evidence of paleomagnetism can be found in ________.

In the heliocentric model ________.

Wegener’s idea of continental drift was rejected by American geologists because ________.

According to the Big Bang theory, our Universe is ________.

By far the most common elements in the Universe and in our Solar System are ________.

The majority of caves are formed by the dissolution of bedrock ________.

A meander that is cut off to become completely isolated from the main channel but which retains water is a(n) ________.

Land subsidence is likely when ________.