6th Grade Strand 6 Concept 1


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6th Grade Strand 6 Concept 1

  1. 1. Characteristics and Structure of Earth’s Lakes & Rivers Kelly Marcellus EED 411 Science Wiki
  2. 2. Student Performance Objective <ul><li>Strand 6: Earth and Space Sciences </li></ul><ul><li>Concept 1: Structure of the earth and its atmosphere </li></ul><ul><li>Grade Level: 6 </li></ul><ul><li>PO 2: Explain the composition, properties, and structure of the Earth’s lakes and rivers. </li></ul>You will explain the characteristics and structure of the Earth’s lakes and rivers.
  3. 3. What’s in Earth’s Rivers and Lakes? <ul><li>You guessed it…water! And water is remarkable. </li></ul><ul><li> You can't taste it, smell it, and you can almost see right through it. It is the only thing on earth that can exist naturally as a solid, a liquid and a gas. Liquid water is found in rivers, lakes and oceans. Solid water is water that is frozen, like snow and ice. Water is a gas when it is in the air of our atmosphere as vapor or steam. Water is necessary for the survival of people, plants, and animals…. </li></ul>
  4. 4. Water is Everywhere <ul><li>Water covers over 70 percent of the Earth's surface. It's everywhere, not only on the surface, but also underground and in the atmosphere. Out of all the water on earth, 97 percent is salt water (found in the oceans). That means only three percent of all the water on earth is fresh water. </li></ul><ul><li>Of the three percent fresh water, two percent is solid, frozen in icecaps and glaciers. Out of all the water on earth, only one percent is drinkable , and much of that water is found in Earth’s lakes and rivers. </li></ul>
  5. 5. Earth’s Lakes & Rivers <ul><li>A major part of Earth ’s natural balance includes its large supply of water. Besides the enormous oceans, waterways such as lakes and rivers circulate water through the continents and back out to sea.  </li></ul><ul><li>Some of the rivers you know include: </li></ul><ul><li>The Nile </li></ul><ul><li>The Mississippi </li></ul><ul><li>The Congo </li></ul><ul><li>The Amazon </li></ul><ul><li>The Rio Grande </li></ul>
  6. 6. Earth’s Lakes & Rivers <ul><li>Some of the lakes you know may include: </li></ul><ul><li>Lake Superior </li></ul><ul><li>Lake Michigan </li></ul><ul><li>Caspian Sea </li></ul><ul><li>Lake Tahoe </li></ul><ul><li>Lake Pleasant </li></ul><ul><li>Can you think of any others? </li></ul>
  7. 7. What’s with the Giant Puddles? <ul><li>Lakes are enormous holding areas of freshwater. </li></ul><ul><li>Some lakes are situated in mountain areas where snow from the surrounding mountains drains into one area. The mountains form a bowl where water pools up. </li></ul><ul><li>When the lake reaches a certain level, the water spills out and flows down the side of the mountain as a river or stream. </li></ul>
  8. 8. Where does the River Go? <ul><li>Many of those rivers that you recognized are HUGE rivers spanning for miles, that are constantly flowing into the ocean. The water goes from from higher elevations to lower elevations and eventually the ocean, or even sometimes a lake or reservoir. </li></ul>&quot;Rivers flow through almost every country in the world. They carry water from Earth's mountain ranges, across sweeping plains, and down to the sea.” ~Ellen R. Butts
  9. 9. Composition, Properties, and Structure of RIVERS <ul><li>Rivers have a significant value in the Earth’s water cycle because they are a key component to the transportation of surface water. They drain the landscape, and move water, and minerals towards the Earth ’s oceans. </li></ul><ul><li>Rivers usually begin at a larger water source such as an upper level lake or bay and they generally flow downstream. </li></ul><ul><li>Rivers often merge with others before completing its journey to some larger water basin such as the sea. </li></ul>
  10. 10. Composition, Properties, and Structure of RIVERS <ul><li>As water drains it generally begins in small creeks, which flow into larger and larger streams, and eventually into powerful flowing rivers. </li></ul><ul><li>The largest river on Earth is the Amazon, which drains much of South America. </li></ul><ul><li>The largest river in North America is the Mississippi River, which drains over 40% of that continent. </li></ul>
  11. 11. Composition, Properties, and Structure of LAKES <ul><li>Lakes contain about 90% of all the surface water found on Earth. (not including oceans) </li></ul><ul><li>Lakes are usually connected to some other water source such as a river, stream, pond, or underground system that carries water.  </li></ul><ul><li>Lakes vary in depth and distance. They also vary in locations and altitudes, and can be found in all geographical locations and in all climatic zones. </li></ul>
  12. 12. Composition, Properties, and Structure of LAKES <ul><li>No one is certain as to how many actual lakes exist in the world. </li></ul><ul><li>Most lakes contain fresh water. However, sometimes the water found in a lake can become salty, just like the ocean. This happens when a lake does not have a stream, either above ground, or underground draining water away from it. As water enters a lake, it carries minerals with it. As this water dissolves, it leaves the minerals behind. </li></ul><ul><li>In order to continue existing, lakes must have a continual source of new water, otherwise they will eventually dry up. </li></ul>
  13. 13. Lakes
  14. 14. Rivers