Question

Assertion :The first is the sinking or uplift of landmasses. Islands and continents can rise and fall due to tectonics or due to the melting or growing of glaciers and ice sheets. Reason: Temperature causes water to expand or contract, thus increasing or decreasing the volume of the ocean.

• A. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
• B. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
• C. Assertion is correct but Reason is incorrect
• D. Both Assertion and Reason are incorrect

Answer 1

The correct option is B Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

There are three primary reasons why sea level changes:

1. The first is the sinking or uplift of landmasses. Islands and continents can rise and fall due to tectonics or due to the melting or growing of glaciers and ice sheets.
2. The second is the increase or decrease in the total amount of water in the oceans. This is primarily caused by the increase or decrease in the quantity of global ice on the Earth's landmasses. During the biggest Pleistocene glaciations about 20,000 years ago, mean sea level was about 400 feet (120 meters) lower than mean sea level today. If all of the Earth's ice sheets and glaciers were to melt, sea level could be up to 265 feet (80 meters) above current mean sea level.
3. Temperature causes water to expand or contract, thus increasing or decreasing the volume of the ocean.