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Definitions from the Web

Term: Coal

Definition: Coal is a black or brownish-black combustible mineral substance found underground, formed from the remains of ancient plants.

Senses:

1. A sedimentary rock that is primarily composed of carbon, with varying amounts of other elements such as hydrogen, sulfur, oxygen, and nitrogen.
2. A source of heat energy and fuel used for electricity generation and industrial processes.

Sample Sentences:

1. Coal is a non-renewable resource that is excavated from mines.
2. The power plant relies on coal as its main source of fuel.
3. When burned, coal produces carbon dioxide and contributes to air pollution.

Term: Petroleum

Definition: Petroleum, also known as crude oil, is a naturally occurring liquid found beneath the Earth's surface composed of hydrocarbon deposits.

Senses:

1. A fossil fuel that is extracted from the ground and refined to produce gasoline, diesel, jet fuel, and other petroleum-based products.
2. A vital resource used extensively in transportation, heating, and industrial applications.

Sample Sentences:

1. The Middle East is rich in petroleum reserves.
2. Oil refineries play a crucial role in processing and purifying petroleum.
3. We rely heavily on petroleum for our vehicles and machinery.