5th Grade Quiz

A natural event that is not caused by any humans.

• Human-caused incident
• Artificial event
• Man-made occurrence
• Natural phenomena

When an ecosystem has mechanisms that enable them to recover and restore their previous condition...

A volcanic eruption, a hurricane or a mudslide is an example of:

• Ecological Disturbances

• Geological events
• Environmental phenomena
• Man-made disasters

What are some harmful substances that can pollute clean air?

• Carbon dioxide

• Methane

• Oxygen

• Nitrogen dioxide

What are the dangers of water contamination?

• Increased risk of waterborne diseases

• Harmful effects on aquatic life

• Negative impact on agriculture

• All of the above

What are some effective methods for reducing harmful substances in the environment?

Layers of gases that surround Earth and that is formed of nitrogen, oxygen, argon and carbon dioxide.

Decomposers become more active and deplete the oxygen in the water so that organisms die.

• Eutrophication

• Acid Rain

• Landfill

• Green house gases

Draw an example of pollution in an ecosystem.

Mention 2 types of pollution: