Wild animals have their own epidemics, which are called epizootics, as well as circulating diseases like colds or flus in humans. Overviews of epizootic prevalence in animals are rare in the literature, but epizootics are common in nature.
Materials per Group of Students 6 cups, 9-oz clear plastic 6 cups, 2-oz clear plastic or bottle caps 6 spoons or coffee stirrers Beaker, — mL Tsp each of salt, sugar, flour, oil cleardiluted food coloring and ground coffee not instant Water Copy of the student sheet Setup Before beginning, prepare a dilute solution of food coloring by adding several drops of any color to a glass of water.
This will be one of the substances tested in this activity. Set all the materials in a central area. Students should work in groups of four. Procedure and Extensions Distribute a copy of the student page to each group. Have Materials Managers pick up materials for their groups.
Show the students a clear glass of water. Ask, Have you ever mixed or stirred something into a glass of water? Do you think that everything can mix with water? Tell students that they will observe what happens when they mix different things with water.
Before student groups begin, have them predict what will happen when they mix each substance with water. Have students measure approximately mL of water into each of the six cups.
Guide the groups as they conduct their tests, one substance at a time, in separate cups. For each test, ask students to observe the substance. Ask, Is it a liquid or a solid? Next, have students measure about one teaspoon of the substance into one of the cups of water and stir until there is no change in the mixture.
Finally, they should note what happened and record their observations. When students have completed their investigations, discuss their observations. Expect the following results. Will dissolve disappearleaving a clear solution. Will not dissolve; the mixture will be cloudy, because the large flour particles will remain suspended in the water example of a colloid.
Will not dissolve; the oil will float on top of the water because the oil is less dense, and because the oil molecules will not mix with the water molecules.
Will dissolve; the resulting transparent liquid will be colored. Part of the coffee will dissolve in the water, coloring it brown; the remainder of the coffee woody parts of the coffee bean will not dissolve or disperse through the liquid and will float. Ask, Which things disappeared into the water when you stirred?
Do you think that they salt or sugar are still there? How could you figure this out? Ask about the other substances.
Have students think about things that remain in water after it is used for cleaning, rinsing, etc. Ask, How this might contribute to water pollution?The EPA's Science and Technological Achievement Awards (STAA) program promotes and recognizes scientific and technological achievement by EPA employees.
STAA is among the most prestigious of EPA's scientific awards programs. The STAA program is an agency-wide competition sponsored by the Office of. Sep 10, · Over 6, years ago, the Egyptians gave birth to paper by using the papyrus plant as the source.
The "paper plant" is native to central Africa and the Nile River Valley and was in abundant supply in ancient Egypt. Historical Perspective * Early Environmental Legislations. * Environmental Legislations in the 70s.
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Physical Science Lesson: What Dissolves in Water? Students investigate whether several common substances are soluble in water. Student sheets are provided in English and in Spanish. Grades K Because wetlands occur in so many different parts of the world and vary greatly, there are many different words used to describe them, even within the English r-bridal.com you may have heard are: slough, swamp, bayou, bog, estuary, fen, and vernal pond.