Sophia - Environmental Science - Unit 3 Challenge 2.

1 — Water Recognize the breakdown of water on Earth. Choose the true statement about water on Earth. • a.) The majority of freshwater is contained in the ocean. • b.) A large percentage of the Earth’s freshwater is accessible to humans. • c.) Approximately 80% of the water on Earth can be found in oceans. • d.) Oceans cover about 70% of the Earth’s surface. 2 — Water Supply: Groundwater Identify where fresh drinking water is located and how humans can access it. Which of the following statements about groundwater is NOT true? • a.) Groundwater provides most of the drinking water consumed by humans. • b.) Lining and sealing wells can protect groundwater from biological or chemical contamination. • c.) Roads built by humans enable water to soak into the earth. • d.) Chemical fertilizer runoff is a common source of groundwater contamination. 3 — Water Supply: Dams Determine the benefits and impacts of dams. Which of the following is an argument for the removal of dams? • a.) Biodiversity will decrease upon a dam’s removal, but species will soon return. • b.) The region’s growing population is placing an increased demand on water supplies. • c.) Dam removal will result in an increase in hydroelectric power in the short term. • d.) We must restore water flow to improve animal habitat and promote biodiversity. 4 — Water Availability Recognize issues related to the availability of water. Which of the following statements is true about water supply and demand? • a.) Water use has been growing at five times the rate of population growth. • b.) The amount of available clean water is increasing due to technology. • c.) Agriculture uses 90% of readily available freshwater. • d.) Many major aquifers have reduced levels of available water. 5 — Water Pollution: Point vs. Non-Point Source