. . . is a clean energy source *petroleum
coal
nuclear energy
gasoline

. . . is/are a non-renewable source of energy

fossil fuels
geothermal energy
nuclear energy
the sun

Pertoleum, natural gas and coal are examples of . . . .

renewable energy sources
non-renewable energy sources
electromagnet energy sources
environment energy sources
Atoms have a . . . at their centre

nucleus
magnet
cells
electricity

To save energy, we should . . . .

turn on many lights at night so that it will be bright.
keep the TV turned on when we are sleeping.
open windows during the day to let the wind in.
play on a computer while watching TV and listening to the radio.

Steam from deep inside the Earth can turn generator .... in power plants

turbines
water
power lines
cells

A/an . . . uses electricity to attract magnet objects

wind turbine
atom
electromagnet
fan

. . . ,that are used in toys and gadgets are another source of electricity

turbines
generators
power plants
cells

Burning fossil fuels to generate energy creates . . . .

clean environment
pollution
fresh air
clear water​