Earthquakes , sources of energy and air pollution

Earthquakes , sources of energy and air pollution

EARTHQUAKE

An earthquake (also known as a quake, tremor or temblor) is the shaking of the surface of the Earth resulting from a sudden release of energy in the Earth's lithosphere that creates seismic waves. Earthquakes can range in size from those that are so weak that they cannot be felt to those violent enough to propel objects and people into the air, and wreak destruction across entire cities. 

Multiple Choice

Earthquakes generate compressional waves [P-waves] and shear waves [S-waves]. Compared to the speed of shear waves in a given earth material, the speed of compressional waves is-

• always faster

• always slower

• always the same

• sometimes faster and sometimes slower

SOURCES OF ENERGY

The energy we use to power everything from our homes to schools and workplaces comes from a variety of different sources. These can be broken down into renewable and non-renewable energy sources.

Multiple Choice

What is one advantage of using hydroelectricity as an energy source?

• Heat is captured under the earth

• It might change the migration patterns of salmon

• Reservoirs can be used to irrigate crops

• It doesn't need motion to turn turbines.

AIR POLLUTION

Air pollution refers to the release of pollutants into the air that are detrimental to human health and the planet as a whole. Most air pollution comes from energy use and production.

Multiple Choice

A colorless, odorless gas that decreases the blood's ability to carry oxygen.  Can cause faintness, death.

• Nitrogen oxides
• Ground-level ozone
• Carbon monoxide
• Sulfur dioxide

Poll

Carbon dioxide is a greenhouse gas.

• True

• False