What is the Empty Quarter?

a. an oasis
b. a desert
c. a mountain range
d. a tectonic plate

http://www.google.com/search?q=Empty+Quarter&oq=Empty+Quarter&aqs=chrome..69i57.1653j0j7&sourceid=chrome&es_sm=119&ie=UTF-8

The Empty Quarter, also known as Rub' al Khali, is a vast desert and is considered the largest continuous sand desert in the world. It covers a significant portion of the Arabian Peninsula, specifically the southern part. To determine the correct answer, we can eliminate options based on the given information.

Option a: an oasis - an oasis is a fertile area in a desert where water is present, usually surrounded by vegetation. Since the Empty Quarter is a desert, it is not an oasis.

Option c: a mountain range - a mountain range is a series of connected mountains. The Empty Quarter does not consist of mountains, so it is not a mountain range.

Option d: a tectonic plate - a tectonic plate refers to large sections of the Earth's crust that are constantly moving. The Empty Quarter is a geographical feature and does not fit the definition of a tectonic plate.

Based on the information provided, the correct answer is b. a desert, as the Empty Quarter is a vast desert in the Arabian Peninsula.