Which term describes a pure substance that is made up of only one type of atom?

Element

Explanation:

An element can be defined as the pure substances as it is made of same types of atoms. These are entirely made from one type of atom.

Example is hydrogen atom is made of single type of atom containing only one proton and one electron. These atoms are arranged in a proper way.

All the elements are made of single type of atoms either it is hydrogen, helium, carbon, nitrogen, phosphorous, et cetera.

Hence, the correct answer is element.

volcanoes (an event in the geosphere) release a large amount of particulate matter into the atmosphere. these particles serve as nuclei for the formation of water droplets (hydrosphere). rainfall (hydrosphere) often increases following an eruption, stimulating plant growth (biosphere).