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Lakes (Grade 6)

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Lakes and ponds are both inland bodies of standing water.
  1. True
  2. False
In order to be classified as a lake, a body of water must be at least 10 meters (32.8 feet) deep.
  1. True
  2. False
All lakes contain fresh water.
  1. True
  2. False
A bend in a river becomes cut off from the main river. A lake forms in the separated bend. This is called an oxbow lake.
  1. True
  2. False
Two tectonic plates move apart. Over time, lakes develop in the valleys formed when the plates split apart. The lakes that form in the valleys are glacial lakes.
  1. True
  2. False
Former lakes are lakes that have dried out and no longer exist. Human activity can cause lakes to dry out.
  1. True
  2. False
A(n)                is a body of water that usually forms behind a dam.
  1. reservoir
  2. water table
  3. aquifer
  4. watershed
Water pollution in lakes can occur from runoff from fertilizer and pesticides used when farming. What is this type of pollution caused by?
  1. farm animals
  2. human activity
  3. a natural disaster
  4. changing weather patterns
Lake Baikal in Russia is considered the largest freshwater lake in the world by volume. It holds about one-fifth of Earth's liquid, fresh surface water. America's Lake Superior holds the largest volume of fresh surface water in North America.

Which is a correct conclusion that can be drawn from the passage?
  1. Lake Baikal holds one-fifth of the world's water.
  2. Lake Baikal covers more area than any other lake.
  3. Lake Baikal is the world's largest source of drinking water.
  4. Lake Baikal holds a larger volume of fresh water than Lake Superior.
Sarah measures the water depth of a lake. Each time she measures the depth at the same place. She takes three measurements, each taken one week apart. Sarah finds that the water depth increases with each measurement.

Which statement best explains Sarah's findings?
  1. The volumes of water entering and leaving the lake are equal.
  2. The volume of water leaving the lake is greater than the volume of water entering the lake.
  3. The volume of water entering the lake is greater than the volume of water leaving the lake.
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