DSWO WEEK 12
DSWO WEEK 12
11-5 Physical - Oceanography
Since light passes through water, why can’t you see to the bottom of a very deep clear pool? Do you think the ocean floor contains any living things?
11-6 Earth - Environment
Acid rain is a pollution problem that has grown worse in the last 30 years. How does the automobile contribute to this problem?
11-7 Life – Circulatory System
Look at this bold chart. Which blood type can be used as a donor for any other type? Which blood type can receive blood from any type?
A AB A
B AB B
O AB A B O
11-8 Physical - -Physics
How does a Styrofoam cooler keep food cold?
11-5 As light passes through water, the water absorbs some of the light. As water gets deeper, more light is absorbed. The deepest parts of a large body of water are completely dark. About 150 years ago, scientists discovered that the ocean floor teems with life, however little is known about these deep-sea life forms. For centuries it was believed that the lack of light and pressure of the water made life on the floor of the deep impossible.
11-6 The automobile burns oil and gas for energy. The burning of these fuels releases sulfur dioxide and nitrogen oxides into the air. Acid rain forms when water vapor in the air reacts with chemical compounds such as sulfur dioxide and nitrogen oxides from fuel combustion. These acids react with water to form harmful substances, sulfuric and nitric acids. Any one rain fall may contain only a small amount of theses acids, but over time they accumulate, polluting lakes and rivers and killing fish and other marine life.
11-7 Type O blood is acceptable to anyone, no matter what their blood type. Type AB blood can receive any of the 4 blood types. But it is best to receive the same type of blood that is in your body.
11-8 The Styrofoam, with its trapped bubbles of air, acts as an insulator, or barrier, keeping the molecules of hot air outside the container from hitting the molecules of cold food inside the container. Another good insulator is the borosilicate of a thermos bottle, which keeps liquids hot or cold by preventing heat from passing in or out of the bottle. Some poor insulators are porous materials like paper, pine and other soft woods, and cotton cloth.