Abowl-shaped depression at the head of a glacial valley is a. a horn b. an arête c. a cirque d. a trough

The right option is; C. a cirque

A bowl-shaped depression at the head of a glacial valley is a cirque.

A cirque, (also called corrie) is a bowl shaped basin that has precipitous walls at the head of a glacial valley. Cirque is usually formed by erosion under the bergschrund (series of fissure) of a glacier. The section of a cirque that is cupped shaped is usually steep, while the concave shape is opened on the downhill side. Examples of cirques and their location include; Circo de Gredos in Spain, and Chandra Taal in India.

one of the most common forms of pain or discomfort we feel during strenuous exercise is a burning sensation in our lungs or muscles that goes away shortly after we cease the activity. this is caused by a build-up of lactic acid.

both male and female gametes are produced by meiosis of the germ cells. therefore, both male and female gametes are haploid. one male and one female gamete unite during the fertilization to form the diploid zygote. in seed bearing plants, pollen grain is the male gametophyte, which produces sperm cells.