INDIAN GEOGRAPHY

Detailed explanation-1: -Oxygen is by far the most abundant element in the Earth’s crust, making up 46% of mass-coming up just short of half of the total. Oxygen is a highly reactive element that combines with other elements, forming oxides.

Detailed explanation-2: -Note (from the text and from class) that oxygen and silicon account for 75% of the weight of the Earth’s crust.

Detailed explanation-3: -Oxygen is an element which is highly reactive and also easily combines with other elements. Because of this, oxygen is found in a large number of common compounds both on Earth and in the crust, specifically.

Detailed explanation-4: -Oxygen is the most common element in Earth’s crust and iron is the most common element in Earth’s core. Approximately what proportion of Earth’s crust is composed of the elements oxygen and silicon? Sand found in commercial sand and gravel deposits is typically composed of silicate minerals.