Question

1. Which observation supported Wegener’s theory of continental drift?

Answer 1

Answer:

1- Option (B)

2- Option (D)

3- Option (A)

Explanation:

1) The continental drift theory was introduced by Alfred Wegener, which described the large scale movement of the continents over the vast ocean water body. He provided many evidences of which one is that the similar type of fossil assemblages were found in the distant continents.

2) In a divergent plate boundary, two plates move away from one another, and results in the formation of new oceanic crust, along the mid oceanic ridges and seafloor spreading takes place extensively.

3) In a convection cell, the hot and less dense materials rises up slowly, and as it rises upward it cools, and eventually sinks, giving rise to the formation of cells. For example, in the mantle region of the earth, the less dense magma rises upward, more dense magma sinks, forming convection cells.

Thus, the correct answers are given above.

Answer 2

1. "Identical fossils were found on continents that were far apart" is the observation that supported Wegener’s theory of continental drift. The correct option among all the options given in the question is the second option.

2. "Volcanoes" is the one among the following choices given in the question that happens when tectonic plates move apart. The correct option among all the options given is the first option.

3. "Cold, dense material sinks while hot, less dense material rises" is what happens in a convection cell. The correct option among all the options given in the question is the first option.