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7th grade Koch Quest
properties of water and composition of oceans
| Question | Answer |
|---|---|
| What is the deepest ocean on Earth? | The Pacific Ocean |
| What are two sources of water for Earths Oceans? | 1. condensation 2. water from volcanoes condenses and precipitates 3. from asteroids and comets |
| How did Earths oceans become salty? | Over time rain has fallen on Earth and washed over rocks. When this happens it dissolves minerals. The minerals contain substances that form salts. |
| Define Salinity | a measurement of dissolved solids in a body of water |
| What is the difference between seawater an brackish water? | seawater is only water from the sea or an ocean while brackish water is a mixture of both fresh and sea water. |
| State four things scientist look for when classifying ocean zones | 1. amount of sunlight 2. temperature 3.salinity 4. density |
| State three resources found on or beneath the ocean floor | 1.oil 2.natural gas 3.gold 4.zinc 5.methane hydrates |
| Which Ocean/Sea is the saltiest? | The Dead Sea |
| What is cohesion? | it is the attraction of molecules that are similar or alike. |
| What is adhesion? | The attraction between molecules that are not similar or alike. |
| Why is water warmer under the surface of ice on a pond or body of water? | The ice is insulating the heat below it which helps the animals underneath the water to stay alive and keep warmer than they would be if the ice weren't insulating the heat. |
| Which states of matter can water be in the form of on Earth? | Solid, liquid, and gas |
| What happens when sugar is added to water? | It dissolves in the water. |
| Why does ice float in water? | The ice is less dense than the water it is floating in. |
| What is polarity? | Polarity is a condition in which ends of a molecule have opposite charges but the overall charge is neutral |
| Why is water sometimes called the universal solvent? | It's because there is so much water on Earth. |
| Why are water molecules attracted to one another? | The negative atom of one molecule attracts a positive hydrogen atom of another molecule |
| Define what an ocean current is. | An ocean current is a large volume of water that is flowing in a certain direction as a whole. |
| What is a Gyre? | A Gyre is a circular system of currents. |
| Name three of the five major Gyre's in the world. | 1. North Pacific 2. South Pacific 3. Indian Ocean 4. North Atlantic 5. South Atlantic |
| Identify one benefit of Upwelling. | It brings nutrient rich water. |
| Why does Upwelling occur? | It occurs when wind blows across the oceans surface and pushes water away from an area. |
| What causes a density current? | Changes in density. |
| In the Southern Hemisphere currents curve to the ____ in a ________________ direction. Fill in the blanks. | Left and Counterclockwise. |
| In the Northern Hemisphere currents urge to the _____ in a _________ direction. Fill in the blanks. | Right and Clockwise. |
Created by:
zjaygirl
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