Question | Answer |
what is water pollution | the addition of any substance that has a negative effect on water or living things that depend on water |
what is fertilizer | chemicals generally used on farms to promote growth of crops. they also encourage excessive growth of plants and algae in and near bodies of water |
salinity | amount of dissolved salts in the water |
salinity of the ocean | 34-37 percent |
industrial wastes | chemicals, smoke, and heated water from factories and mines |
acid rain | rain that has a lower than normal PH |
what are pesticides | chemicals intended to kill insects and other organisms that damage crops these chemicals can also kill organisms living in nearby bodies of water |
What are the differences between ponds and lakes | Ponds are more shallow and sunlight reaches the bottom |
What is lake turnover | Lake turnover is the seasonal change that causes water in a lake to mix and nutrients to be refreshed throughout the lake. |
Eutrophication | The process that occurs when nutrients build-up in a lake. |
What is oxygen | A gas required by all animals that dissolves in water. |
Temperature | At the surface, the temperature of teh ocean is controlled by the weather. The temperature of ocean water drops rapidely in the transition zone. The deep zone is always cold. |
Pressure | Pressure increases stedily as the deeper the water gets |
Salinity | The total amount of dissolved salts in the water. In the ocean, the salinity is between 34, and 37 parts per thousand. |
Light | Needed for the growth of plants an d algea. This penetraits the surface of the ocean, but none can reach below -200 meters. |
We see a new moon when... | the Earth is in line between hte sun and the Earth. |
We see a full moon when... | teh Earth is in line between the sun and the moon. |
We see a half moon when... | the sun earth and moon are at a 90 degree angle. |
There is a Spring tide when... | there is a new or a full moon |
There is a neap tide when... | there is a half moon. |