4. Before the present theory of plate tectonics, scientists used the hypothesis of continental drift to propose that Earth's con
tinents are in motion. Which of the following were initially used to support the hypothesis of continental drift? I. the matching shapes of continent edges
II. similar fossils on different continents
III. matching rock types on different continents
IV. evidence in the rock record for climate change
II and III only
II, III, and IV only
I, II, III, and IV
I and IV only
It was in 1912 that the first geologist elaborated a formal theory that the continents, at some point in geological history, would have been only one. He noted that some fossils, soil types, and vegetation were the same or similar in different regions of the earth separated by oceans.
However, it was only after World War II (1939-1945) that the movement of the Tectonic Plates was scientifically discovered, the missing piece for proof that the continents were moving and had previously split. Over the years, scientists have been discovering and describing the stages of formation of the present form of the earth.
The achievement of sovereignty for the Quebec state. The creation of a political and economic association between this new independent state and Canada.
Cirques are created when glaciers erode the mountainside, scouring into it and creating rounded hollows with steep uphill faces, shaped like tilted bowls. A cirque is often more visible after the glacier melts away and leaves the bowl-shaped landform behind.
