How to Speak Tagalog. Learning to speak a few handy words and phrases in Tagalog, which is sometimes also called Filipino, can make traveling in the Philippines much easier. Because of the Philippines' colonial history, Tagalog contains.
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A veritable legion of evidence supports the seafloor spreading hypothesis. Studies conducted with thermal probes, for example, indicate that the through bottom sediments is generally comparable to that through the continents except over the mid-ocean ridges, where at some sites the flow measures three to four times the normal value. The anomalously high values are considered to reflect the intrusion of molten material near the crests of the ridges.
Research has also revealed that the ridge crests are characterized by anomalously low velocities, which can be attributed to and microfracturing associated with the upwelling magma. Measurements of the thickness of and absolute age determinations of such bottom material have provided additional evidence for seafloor spreading. The oldest sediments so far recovered by a variety of methods—including coring, dredging, and deep-sea drilling—date only to the, not exceeding about 200 million years in age. Such findings are incompatible with the doctrine of the permanency of the that had prevailed among Earth scientists for so many years. This article was most recently revised and updated by, Editor.
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March 2023
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