Question

Define combustion
Define natural resources ​

Answer 1

Combustion is the burning process in which a substance combines with the oxygen and thus produce heat and light.

A natural resource is anything that people can use which comes from the natural environment. Examples of natural resources are air, water, wood, oil, wind energy, iron, and coal.

Answer 2

Explanation:

1. Combustion is a chemical process in which a substance reacts rapidly with oxygen and gives off heat. The original substance is called the fuel, and the source of oxygen is called the oxidizer. The fuel can be a solid, liquid, or gas, although for airplane propulsion the fuel is usually a liquid.
2. Natural resources are resources that exist without any actions of humankind. This includes all valued characteristics such as magnetic, gravitational, electrical properties and forces, etc