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Science: Ocean Water
Quiz: Thursday, March 22nd 2012
| Question | Answer |
|---|---|
| water covers ___ of the earth. | 2/3 |
| ocean is a mixture of _____ and _____. | water and salts |
| Three specific things in the ocean are: 1. ______ _______ 2. _________ ________ 3. ________ ________ | 1. sodium chloride 2. potassium chloride 3. magnesium chloride |
| Was the ocean always salty? | No |
| How did the oceans become salty? | Rocks and soil was washed into it by rivers and streams, and they dissolved to make salty, and they sink to form sediment |
| Each year, ____ billion kg or ___ million tons for sediments wash into the ocean. | 364 billion, and 400 million tons |
| When the water evaporates, any _________ __________ remains. | dissolved substances |
| On average, ___% of ocean water is dissolved salt. | 3.5% |
| Salinity | The total amount of dissolved salt in the ocean water |
| high levels of rainfall= ___ salinity | low |
| low levels of rainfall= ____ salinity | high |
| __ 0f the known 118 elements are found in the _____. (68%) | 80, ocean |
| dissolved gasses are- | Oxygen, carbon dioxide, and nitrogen |
| Some of the dissolved gasses depend on what things and why? | water depth and temprature- water depth- closer to the surface, there is more oxygen because the sunlight allows photosynthetic organisms to produce oxygen. Temprature- gasses dissolve better in cloder temps. Warmer climates have less dissolved gases |
| organisms living in the ocean rely on the _____ and other substances found there | gasses |
| plankton | microscopic organisms that live on the surface or near the ocean. |
| phytoplankton | plant-like plankton that requires water and sunlight. They make thier own food. |
| zooplankton | animal-like plankton that need and eat photoplankton |
| sediments include what things? | bits of shells, decaying organisms andsand |
| Sediments dissolve. True or false? | false- they do not dissolve |
| What would happen if sediments did dissolve? | It would cause oceans to become shallow, and the water wouls over flow ocean to the land. |
| dredging | the process where a michine scrapes the ocean floor and returns the sediments to the land. |
| ______ cause pollution | humans |
| ______ are dumped into the ocean | wastes |
| the bends cause what? | a build-up of nitrogen bubbles in your blood |
| SCUBA stands for what? | Self-Contained-Underwater-Breathing-Apparatus |
| scuba divers need _ to _ weeks of training | 1 to 8 |
| the deeper you go the more what? | dangerous |
| water pressure increases as depth _________ | increases |
| you need to do what when you are scuba diving when you come up to the surface? Why? | Come up slowly so you can breathe out the nitrogen |
| normal ocean pressure is- | 14.7 lbs/in2 |
| mariana trentch | deepest part of the ocean |
| what decreases with depth? | visibility |
| What does surface water absorb? Why? | Light- the green and blue are reflected and the other colors penetrate into the ocean depths |
| No sunlight/heat penetrates to the ocean depths True or false? | true |
| as depth increases, temp _________, but does not freeze because of what? | decreases pressure |
Created by:
bridge13
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