Bài kiểm tra về tài nguyên thiên nhiên

Many of the Earth's natural resources are _______________, meaning they are available in limited quantities and can be depleted.

Oil is a relatively _______________ resource but is a non-renewable source.

_______________ fuels, including coal, oil, and natural gas, are currently the main energy sources of the world.

_______________ resources are those resources that cannot be replaced once they have been used.

_______________ energy is any energy source that can replace fossil fuels.

Although it is the most _______________ source, coal still plays an important role in electricity production.

The solar energy from the sun is _______________ because we will not "use up" all the sunlight from the sun.

Geothermal energy does not cause pollution, but it is not _______________ widely.