Freshwater Biomes

What percentage of Earth's water is freshwater?

• 2.5%
• 10%
• 5%
• 1%

Define a watershed.

• A watershed is an area of land that drains into a common water body.
• A watershed is a type of aquatic plant.
• A watershed is a man-made structure for water storage.
• A watershed is a measurement of rainfall in a region.

What happens to water temperature and biodiversity as a river widens?

• Water temperature decreases and biodiversity decreases.
• Water temperature increases and biodiversity may increase.
• Water temperature remains constant and biodiversity decreases.
• Water temperature increases and biodiversity decreases.

What is an estuary?

• An estuary is a coastal area where freshwater meets saltwater and is mixed by the tides.

• A landlocked area with no connection to saltwater.
• A river that flows directly into the ocean without any mixing.
• A freshwater lake that is isolated from the ocean.

What is brackish water?

• Brackish water is water that is only found in lakes.
• Brackish water is water that has a salinity between freshwater and seawater.
• Brackish water is completely freshwater.
• Brackish water has a salinity equal to that of seawater.

Name two sources of nutrient pollution affecting the Chesapeake Bay.

• Agricultural fertilizer

• Acid rain

• Suburban runoff

• City smog

Which of the following are three examples of wetlands?

• rivers, lakes, streams

• mountains, hills, valleys

• coral reef, beaches, estuary

• marshes, swamps, bogs

What three conditions must be present for an area to be classified as a wetland?

• Complete absence of water, clay soils, and non-native plants.
• Presence of water at least part of the year, hydric soils, and hydrophytic vegetation.

• High elevation, rocky terrain, and dry climate.
• Presence of saltwater, sandy soils, and desert vegetation.

How do wetlands help reduce erosion?

• Wetlands act as natural barriers that slow water movement, trapping sediment and reducing erosion.

• Wetlands only serve as habitats for wildlife and do not affect erosion.
• Wetlands increase erosion by allowing water to flow freely causing the sediment to slowly decrease off the banks.

• Wetlands have no impact on soil stability or erosion.

What gases are released when wetlands are disturbed?

• Hydrogen and argon are released when wetlands are disturbed.
• Oxygen and nitrogen are released when wetlands are disturbed.
• Sulfur dioxide and ammonia are released when wetlands are disturbed.
• Carbon dioxide and methane are released when wetlands are disturbed.