Question

Are all substances present on earth as elements!?

Answer 1

Explanation:

Explanation:Almost 99% of the minerals making up the Earth's crust are made up of just eight elements. Most of these elements are found combined with other elements as compounds.

Answer 2

About 99% of the minerals which make up the Earth's crust are made up of  eight main elements, that is, Oxygen, Iron, Calcium, Silicon, Aluminium, Potassium, Sodium and Magnesium.

These elements are found in combination with other elements in the form of  compounds.