Grade 8 Science. Unit 1: Water Systems on Earth Chapter 1
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1 Grade 8 Science Unit 1: Water Systems on Earth Chapter 1
2 Effects of Water? Churchill River
3 Large Ocean Wave
4 How do you use water? House Hold Use Personal Use Recreational Activities
5 Water Distribution
6 Only 3% of the Earth s water is fresh water (no salt). 2/3 of this water is frozen in ice sheets. Therefore only 1% of the fresh water on Earth is available.
7 Review of Terms... Lithosphere: the solid rocky ground of the Earth s crust.
8 Atmosphere: the environment surrounding the Earth.
9 Hydrosphere: All water on Earth. Including that in the lithosphere and atmosphere.
10 Why do we not run out of water?
11 The Water Cycle...
12 The constant cycling of water through the processes of evaporation and condensation Water is constantly changing form (gas liquid) Driven by the sun s energy
13 Scientists who study water Hydrologist: A person who studies Earth s water systems and helps to find solutions to problems of water quality and quantity.
14 2. Oceanographer: A person who studies all aspects of the ocean. They are concerned with the biology, geology, physics, and mathematics of the ocean.
15 Ocean Water vs. Fresh Water Three ways in which fresh water differs from ocean water are: Salinity Density Freezing point
16 1. Salinity The amount of salt dissolved in a specific amount of water. * salt comes from dissolved solids in the ground and volcanoes.
17 Fresh Water tiny amounts of salt. Salt Water Average is 35 ppt. Varies depending on location. at the equator and poles
18 2. Density The amount of mass of a substance in a certain unit volume. How tightly packed together the material is in a substance.
19 Ocean water is more dense than fresh water due to the salt content. The Dead Sea
20 3. Freezing Point The temperature at which a liquid freezes. Fresh water... 0 o C Salt water o C
21 Core Lab Activities Activity 1-3A Salinity s Effect on Water Density Activity 1-3B Temperature & Water Density
22 Sources of Fresh Water 1. Lakes, ponds and wetlands 2. Streams and rivers 3. Ground water 4. Glaciers 5. Drainage basins
23 Ground water... Precipitation that falls on land and sinks out of sight. Sinks through pores in rocks until it reaches bedrock where it pools. Drilling to these pools make wells.
24 Ground Water
25 Runoff does not sink into the ground or evaporate. It flows across the Earth s surface. Affected by ground material, amount of rain, length of time it rains, slope of the land, vegetation, and the amount of development.
26 Glaciers... A moving mass of snow and ice. Found in areas where it is so cold the snow remains all year.
27 Glaciers in mountains and on the continent of Antarctica
28 Glaciers slow down the passage of water through the water cycle by storing vast quantities of water. They release the water during the hot summer months. They give us information about the Earth s past climates.
29 Water trapped in glacial ice
30 The Ice Age The most recent began years ago ending years ago. Glaciers covered ~ 20% of land on Earth.
31
32 Glaciers and Global Warming In the last 100 years the average surface temp. Has increased by 0.5 o C. The world s glaciers are melting at a quicker paces than ever before.
33 Melting Greenland Glacier
34 Receding Athabasca Glacier in Alberta It has receded 1.5 km since 1843.
35
36 What does this mean? Ocean waters may rise Flood rivers If they disappear, rivers may dry up
37 Drainage Basins Watershed The area of land that drains into a body of water such as a river, pond, lake or ocean. There may be many small within a larger basin.
38 A divide separates one basin from another. Ex. The Continental Divide
39 Canadian Drainage Basins
40
41 6 Major Drainage Basins in NL 1. Labrador Sea 2. Gulf of St. Lawrence 3. West Coast Gulf of St. Lawrence 4. South Coast Gulf of St. Lawrence 5. Atlantic Ocean Avalon Peninsula 6. Atlantic Ocean North-east Coast
42 Using pencil leads, indicate the 6 major drainage basins of NL
43 One Component Affects Another... Ex. Salinity affects the types of organisms that can survive in an area. Ex. Temperature affects the amount of dissolved oxygen in water. The lower the temp. the more oxygen.
44 Ex. The convergence of the Labrador current and the Gulf Stream influences productivity of the Grand Banks, the movement of icebergs, and migration of capelin and whales.
45 Debate Topics... Problems/ issues related to the oceans include: 1. Seal hunt 2. Cod moratorium 3. Regional food fishery 4. Oil and gas exploration
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