The driest area of the earth is Atacama-desert. The Atacama Desert is a plateau in South America, covering a 1,000-kilometre strip of land on the Pacific coast, west of the Andes mountains. It is the driest hot desert in the world.

Correct Option: B

The driest area of the earth is Atacama-desert. The Atacama Desert is a plateau in South America, covering a 1,000-kilometre strip of land on the Pacific coast, west of the Andes mountains. It is the driest hot desert in the world.

The Black Mountains are located in USA. The Black Mountains are a mountain range in western North Carolina, in the southeastern United States.

Correct Option: D

The Black Mountains are located in USA. The Black Mountains are a mountain range in western North Carolina, in the southeastern United States.

The clouds of the highest altitude are Cirrostratus. Cirrostratus cloud is a high, thin, generally uniform stratiform genus-type, composed of ice-crystals. It is difficult to detect and is capable of forming halos when the cloud takes the form of thin cirrostratus nebulosus. The cloud has a fibrous texture with no halos if it is thicker cirrostratus fibratus.

Correct Option: D

The clouds of the highest altitude are Cirrostratus. Cirrostratus cloud is a high, thin, generally uniform stratiform genus-type, composed of ice-crystals. It is difficult to detect and is capable of forming halos when the cloud takes the form of thin cirrostratus nebulosus. The cloud has a fibrous texture with no halos if it is thicker cirrostratus fibratus.

Diabatic process

Correct Option: A

Diabatic process

90° E Ridge lies in Indian Ocean. The Ninety East Ridge (also rendered as Ninetyeast Ridge, 90E Ridge or 90° Ridge) is a linear, age-progressive seamount chain in the Indian Ocean and is named for its near-parallel strike along the 9^th meridian. It is approximately 5,000 kilometres (3,100 mi) in length and can be traced topographically from the Bay of Bengal southward towards the Southeast Indian Ridge (SEIR), though the feature continues to the north where it is hidden beneath the sediments of the Bengal Fan. The ridge extends between latitudes 33° S and 17°N and has an average width of 200 km.

Correct Option: B

90° E Ridge lies in Indian Ocean. The Ninety East Ridge (also rendered as Ninetyeast Ridge, 90E Ridge or 90° Ridge) is a linear, age-progressive seamount chain in the Indian Ocean and is named for its near-parallel strike along the 9^th meridian. It is approximately 5,000 kilometres (3,100 mi) in length and can be traced topographically from the Bay of Bengal southward towards the Southeast Indian Ridge (SEIR), though the feature continues to the north where it is hidden beneath the sediments of the Bengal Fan. The ridge extends between latitudes 33° S and 17°N and has an average width of 200 km.