Earth: The Water Planet Questions and Answers
What percentage of Earth's water is freshwater ? Answer: 3% What percentage of Earth's water is salt water? Answer: 97% What is a river system? Answer: A river and its tributaries How are ponds and lakes similar? Answer: They are still, standing bodies of water. Why is so little of Earth's water available for human use? Answer: Only 3% of the Earth's water is freshwater. Of that 3% majority of it is ice. The remaining 97% is salt water. What is the biggest difference between ponds and lakes? Answer: The sunlight can reach the bottom of ponds allowing plants to grow on the bottom. The sunlight cannot reach the bottom of the lake. This means there are no plants and very few organisms. What are the steps of the water cycle? Precipitation, Surface Runoff, Evaporation, Condensation Water that fills cracks and spaces in the ground is called Answer: groundwater In the process of photosynthesis , ...