Ecology Ch 4

Ecology Ch 4

Multiple Select

Water is scarce on Earth

• True

• False

Multiple Choice

Salt water accounts for what percent of Earth’s water?

• 50%

• 75%

• 89%

• 97%

Multiple Choice

What is water stored in the soil and rock beneath Earth’s surface?

• Groundwater

• Drinking water

• Reservoir

Multiple Select

Water pollution is a direct result of humans

• True

• False

Multiple Choice

What are chemicals that kill crop-destroying organisms?

• Pesticides

• Farm Chemicals

• Bug Killer

• Weed Killer

Multiple Select

Sewage is water and human wastes that are washed down (select all that apply)

• Sinks

• Showers

• Toilets

Multiple Choice

What word means the solid particles that have settled out during the sedimentation process.

• sediment
• solubility
• settlement
• solidifying

Multiple Select

Select ALL of the areas that create water pollution.

• Industries

• Mines

• Factories

• Oil Spills

Multiple Choice

Effective cleanup of oil and gasoline spills, proper sewage treatments, and reduction of pollutants need to happen to reduce what?

• Air Pollution

• Water Pollution

• Oil Pollution

Multiple Select

When the water is clean where is it returned to?

• Our taps.

• The sea.

• The river.

• The reservoir.

Multiple Select

What is the sewage network?

• The place where water is cleaned before being returned to rivers.

• The pipes that carry sewage (dirty water) from our houses to the sewage treatment plant.

• The place where all our sewage is cleaned.

• The place where water is cleaned before being returned to our taps.

Multiple Select

What is a sewage treatment plant?

• The place where water is cleaned, filtered and tested before re-entering the water cycle.

• The place where water is cleaned, filtered and tested before going to our houses.

• The network of pipes that carry sewage (dirty water) from our houses.

• The place where water is bottled for drinking.

Multiple Choice

Preliminary treatment

• prevents toxic chemicals.

• removes large objects.

• is unnecessary.

• is useless.

Multiple Choice

What gas must be maintained at precise levels in the aeration tank?

• CO₂
• O₂
• H₂
• CO

Multiple Choice

Bacteria are beneficial to wastewater treatment because

• they naturally break down organic matter
• they help solid material to settle out of the wastewater
• the nutrients produced are beneficial to the treated water
• they aren't beneficial

Multiple Choice

Which substance is used in a sewage treatment system to kill harmful bacteria?

• ammonia

• chlorine

• sand

• soap

Multiple Choice

What is the first step in the water treatment process?

• coagulation

• filtration and removal of debris, sand, grit, etc.

• flocs

• concentation