Environmental Science Unit 2 Review

When molten (melted) rock cools and becomes a solid, a _____ rock forms.

• Igneous         

• Sedimentary

• Metamorphic

• Mineral

Earth's current atmosphere is

• 78% nitrogen, 21% oxygen, 0.9% argon and 0.037% carbon dioxide
• 78% oxygen, 21%nitrogen, 0.9% argon, 0.037% carbon dioxide
• 78% nitrogen, 21% argon, 1% oxygen
• 78% oxygen, 21% nitrogen, 1% carbon dioxide

What is true about nutrients in the ecosystem (such as water, carbon, and nitrogen)?

• They are not affected by humans in the ecosystem.

• They cannot be recovered if they are lost in the ecosystem.

• They cycle through the ecosystem in different forms to support life.

• They are usually only found in one form in the ecosystem to support life.

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When there are not enough plants to hold topsoil in place, water and  _______ carry the topsoil away, leaving the subsoil exposed

• sunlight
• birds
• magnetic fields
• wind

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Soil is made of

• weathered rocks and minerals
• dead plants and animals
• air and water
• all of the above

The number of different species in an ecosystem

• Species services

• Biodiversity

• Habitat services

• Habitat diversity

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Why are plants considered as producers?

• Plants convert energy from the sun into chemical energy in the form of glucose (food).

• Plants produce root crops that supply carbohydrates to animals.

• Plants provide vegetable for animals and human consumption.

• Plants produce fruits that can be eaten by animals.

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the living parts of an ecosystem

• biotic factors
• biology
• abiotic factors
• animals

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The diagram shows a food web.

What would most likely happen to the food web if the amount of grass drastically decreased?

• Only the rabbit would be affected.

• The mouse and grasshopper would be affected.

• The grasshopper, mouse, and shrew would be affected.

• The entire food web would be affected.

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When Convection occurs in the atmosphere

• Cool air rises, warm air sinks

• warm air rises. cool air sinks

• warm air sinks, cool air sinks

• air moves sideways in layers

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