Quiz: Thursday, March 22nd 2012
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
Help!
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| water covers ___ of the earth. | 2/3
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| ocean is a mixture of _____ and _____. | water and salts
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| Three specific things in the ocean are: 1. ______ _______ 2. _________ ________ 3. ________ ________ | 1. sodium chloride
2. potassium chloride
3. magnesium chloride
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| Was the ocean always salty? | No
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| 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
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| Each year, ____ billion kg or ___ million tons for sediments wash into the ocean. | 364 billion, and 400 million tons
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| When the water evaporates, any _________ __________ remains. | dissolved substances
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| On average, ___% of ocean water is dissolved salt. | 3.5%
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| Salinity | The total amount of dissolved salt in the ocean water
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| high levels of rainfall= ___ salinity | low
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| low levels of rainfall= ____ salinity | high
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| __ 0f the known 118 elements are found in the _____. (68%) | 80, ocean
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| dissolved gasses are- | Oxygen, carbon dioxide, and nitrogen
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| 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
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| organisms living in the ocean rely on the _____ and other substances found there | gasses
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| plankton | microscopic organisms that live on the surface or near the ocean.
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| phytoplankton | plant-like plankton that requires water and sunlight. They make thier own food.
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| zooplankton | animal-like plankton that need and eat photoplankton
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| sediments include what things? | bits of shells, decaying organisms andsand
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| Sediments dissolve. True or false? | false- they do not dissolve
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| What would happen if sediments did dissolve? | It would cause oceans to become shallow, and the water wouls over flow ocean to the land.
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| dredging | the process where a michine scrapes the ocean floor and returns the sediments to the land.
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| ______ cause pollution | humans
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| ______ are dumped into the ocean | wastes
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| the bends cause what? | a build-up of nitrogen bubbles in your blood
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| SCUBA stands for what? | Self-Contained-Underwater-Breathing-Apparatus
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| scuba divers need _ to _ weeks of training | 1 to 8
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| the deeper you go the more what? | dangerous
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| water pressure increases as depth _________ | increases
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| 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
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| normal ocean pressure is- | 14.7 lbs/in2
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| mariana trentch | deepest part of the ocean
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| what decreases with depth? | visibility
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| What does surface water absorb? Why? | Light- the green and blue are reflected and the other colors penetrate into the ocean depths
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| No sunlight/heat penetrates to the ocean depths True or false? | true
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| as depth increases, temp _________, but does not freeze because of what? | decreases
pressure
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You may also shuffle the rows of the table by clicking on the "Shuffle" button.
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Created by:
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