A piece of sandstone changing color (from brown to rusty red) from exposure to water and air is an example of:

EARTH SCIENCE

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Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]

A	mechanical weathering
B	chemical weathering
C	Either A or B
D	None of the above

Explanation:

Detailed explanation-1: -Oxidation is another kind of chemical weathering that occurs when oxygen combines with another substance and creates compounds called oxides. Rust, for example, is iron oxide.

Detailed explanation-2: -Oxidation-the breakdown of rock by oxygen and water, often giving iron-rich rocks a rusty-coloured weathered surface.

Detailed explanation-3: -Oxidation is the reaction of rock minerals with oxygen, thus changing the mineral composition of the rock. When minerals in rock oxidize, they become less resistant to weathering. Iron, a commonly known mineral, becomes red or rust colored when oxidized.

Detailed explanation-4: -Chemical weathering changes the composition of a mineral to break it down. Water chemically weathers rock in hydrolysis. Carbon dioxide chemically weathers rock by creating acids. Oxygen chemically weathers rock by combining with a metal.

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