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Ocean Currents
Reviews ocean currents, properties of water, and ocean composition
| Question | Answer |
|---|---|
| Ocean water is ____ water. | Salt |
| The heat from the sun condenses/ evaporates the water in the ocean leaving only salt behind. | Evaporates |
| Ocean currents are caused by _____ and the amount of ____ in the water. | Winds, Salt |
| An ocean _____ is a river of water running through the ocean. | Current |
| Very salty water is _____ than water that is not as salty. | Heavier |
| Thermohaline currents are warm salty/ cold fresh water ocean currents. | Warm Salty |
| Rivers and lakes are not salty because the ____________ in the water flow to the ocean. | Salt (Minerals) |
| The flow of currents in the northern and southern hemispheres are __________. | Opposite |
| Explain how the water in Earth's oceans became salty. | The water billions of years ago washed over dissolved minerals and rocks. The minerals contained substances that formed salts, which is why ocean water is salty. |
| What's the difference between seawater and brackish water? | Seawater is water from a sea or ocean that has an average salinity of 35 part per thousand (ppt) Brackish water is freshwater mixed with seawater. *Where rivers meet oceans. Ex: Mississippi river meets the Gulf of Mexico. |
| Define Salinity. | Salinity is a measure of the mass of dissolved solids in a mass of water. |
| Cite four criteria scientists use when classifying ocean zones. | 1. Amount of sunlight 2. Salinity 3. Density 4. Tempeture |
| What is a Mid-Ocean Ridge? | A mid-ocean ridge is a continuous mountain range that extends through all Earth's basins. |
| What is an Abyssal plain? | Abyssal plains are large, flat areas on the seafloor that extend across the deepest parts of the ocean basins. |
| Classify resources found either on or beneath the ocean floor. | Resources from the seafloor: 1. Energy Resources (oil, natural gas, methane hydrates) 2. Minerals (manganese nodules, gold, zinc) |
| What is an ocean trench? | An ocean trench is the deepest part of the ocean. |
| List five ways in which water is a unique compound. | 1. Only substance which exists as a solid, liquid, and gas. 2. Water has a high specific heat. 3. Water forms drops if you spill it on a counter. 4. Ice floats in a glass of water. 5. Water has unusual properties because of its molecules. |
| Explain cohesion. | The attraction among molecules that are alike. |
| Explain adhesion. | The attraction among molecules that are not alike. |
| True or false? The density of ice is lower than the density of the same volume of liquid water. | True. |
| True or false? The density of freshwater is lowest at four degrees Celsius. | False: Greatest. |
| True or false? The particles of liquid water are closer together than the particles of the same volume of frozen water. | True. |
| Analyze the importance of water's density to life on Earth. | The surface water freezes and floats on top of the pond. The ice insulates the water. The animals in the water survive, because the denser water below remains a liquid. |
| Explain what happens to a frog's environment during a northern winter. | The frog is under the water, and the surface water freezes to ice. The ice keeps the water under the ice warmer than the air above it. |
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