Friday November 30, 2012

1. Friday November 30, 2012 • Learning Target: I can determine the relative density of liquids by comparing their properties. • Essential question : Would salt water or fresh water be more dense? Why? • What would happen to the marine and fresh water in an estuary when the tides come in? • Homework: Complete the multi flow map at the end of the note packet. Study your study guide and vocabulary. • Warm Up: Get out your Venn Diagram from yesterday, review the similarities and differences between the 3 types of aquatic biomes we have studied QUIETLY!!

2. Density Original Density The amount of mass in a given volume (how much “stuff” is in the same space.) When the particles are spread out more, or there are fewer in the same space, it is less dense. When the particles are squeezed closer together, or there are more in the same, space it is more dense

3. Why does Coke sink and Diet coke float in water?

4. Estuaries: Characteristics Abiotic Factors Saltwater and freshwater mix Large supply of nutrients (deposited by the river) Biotic Factors Large diversity of organisms • Where rivers meet the ocean. (freshwater and marine meet) • Between 1and 3.5% Salinity. • Organisms have to be adaptedto to live in a changing environment. • water level and amount of salt(salinity) fluctuates (changes)

5. Independent PracticeCreate a Venn diagram of the characteristics, abiotic & biotic factors of freshwater an marine biomes Freshwater Marine ~ covers 1/ 5 of Earth ~Low salinity (less than 1% salt) ~ lakes (unmoving and limited biodiversity) ~ Ponds(unmoving and limited biodiversity) ~ Rivers (moving – more biodiversity) ~Streams (moving – more biodiversity) ~ Covers 71% of the Earth’s Surface ~deep ~3.5% dissolved minerals (mostly salt) ~ variety of biotic and abiotic factors depending on depth ~Estuary ~Where river meets Ocean ~Between 1 and 3.5% Salinity ~Organisms have to be able to live in a changing environment

6. Freshwater ~V.S~ Marine BiomePart 2 Human Influences

7. Human Influence • 2 types of pollution that affect the aquatic biome • Chemical pollution- the introduction of toxic chemicals into the water. (oil spills, pesticides, bio-hazardous materials, illegal dumping etc.) • Thermal pollution -A common cause of thermal pollution is the use of water as a coolant by power plants and industrial manufacturers. When water used as a coolant is returned to the natural environment at a higher temperature, the change in temperature decreases oxygen supply, and affects ecosystem composition. • threatened by pollution • farm runoff, • industrial discharges, • recreational boating, • and fast-food packaging.

8. Complete for homeworK: Effects of Pollution Causes of Pollution Pollution in Aquatic Biomes

9. Lab • Clear off your table except for your lab sheet & something to write with.

10. Density Original Density The amount of mass in a given volume (how much “stuff” is in the same space.) When the particles are spread out more, or there are fewer in the same space, it is less dense. When the particles are squeezed closer together, or there are more in the same, space it is more dense

11. Lab • A. What is Density? • Density is the amount of mass in a given volume • B. If you put 2 liquids with different densities together in a container, which will sink to the bottom (the one with a higher density or the one with a lower density ? • If you put 2 liquids with different densities in a container, the liquid that is the most dense will sink to the bottom. • C. Which would be more dense (Salt water or fresh water)? • Salt water would be most dense because it will have salt and water in the same space.

12. Make sure you: • Add the liquids in the order they are listed • Circle the color that was more dense • Draw a Label the colors in the drawing of the test tube at the bottom of the page. Name the color Name the color

13. What did you get?

14. 1. What color water do you think represents fresh water? • Green Liquid • 2. What color water do you think represents marine water? • Blue Liquid • 3. What do you think the other color represents? • The red water is from the estuary “brackish water” • What do you think happens in an estuary when the salt water and fresh water come together during high tide? (Discuss what happens when they first come together and what happens to the water in estuaries over time.) • When the tide comes in the salt water is first introduced. The salt water will sink to the bottom and the fresh water will stay on top. This is because the salt water is more dense. • As the fresh and salt water stay together for a period of time they will be are “stirred” by organisms moving around. The salt will spread more evenly into all the water and it will all become “brackish” water. All of the water will have the same salinity and will no longer be separated.

15. Closing • Learning Target: I can determine the relative density of liquids by comparing their properties. • Essential question : Would salt water or fresh water be more dense? Why? • What would happen to the marine and fresh water in an estuary when the tides come in? • Homework: Complete the multi flow map at the end of the note packet. Study your study guide and vocabulary.