Chapter 7.2 -science

Question 1

Fossil fuels:

Answer 1

substance, such as coal, oil and natural gas, that has formed from the remains of ancient organisms. Coal, oil and natural gas are often used as fuels; that is, they are burnt in order to produce heat

Question 2

Peat:

Answer 2

partially decomposed plant matter, buried and compressed over millions of years by layers of other plants in marshy or damp regions

Question 3

Sediments

Answer 3

gravel, sand, mud or silt covered the rotting vegetation

Question 4

Sedimentary rocks:

Answer 4

rocks formed from sediments deposited by water, wind or ice. The sediments are cemented together in layers, under pressure

Question 5

Brown coal.

Answer 5

a form of coal formed from peat compressed over millions of years, with much of the moisture driven out by the weight and heat of the layers above; also known as lignite

Question 6

Black coal

Answer 6

a harder, drier form of coal than brown coal, formed from peat compressed over millions of years, with most of the moisture driven out by the weight and heat of the layers above; also known as anthracite

Question 7

Oil

Answer 7

Oil is a form of fossil fuel

Question 8

Natural gas:

Answer 8

Natural gas: a fossil fuel consisting of mainly methane

Question 9

Porous rocks:

Answer 9

having many pores or other small spaces that can hold a gas or liquid or allow it to pass through