Title: Earth the Water Planet Page #: 23 Date: 10/15/12

Objectives Students will be able to explain the relationship between resident time and the size of a reservoir. Students will be able to identify and distinguish among the 5 major oceans and other bodies of water.

Word of the Day Climate: The meteorological conditions, including temperature, precipitation and wind that prevail in a particular region.

Climate Zones: Deserts, polar areas, tropics are determined by surface temperatures and evaporation - precipitation patterns. (The water cycle.)

Reservoirs and Residence Time Residence Time: The average length of time that a water molecule spends in a reservoir. Calculated by dividing the volume of water in the reservoir by the rate at which the water is replaced. Rule: The larger the reservoir, the longer the residence time.

Reservoirs and Residence Time Examples: Reservoir = Atmosphere holds 13,000 km of water at any given time. Residence time of atmosphere is short. Water stored in the atmosphere can be replaced 29 times per year. Reservoir = Ocean. It takes 37,498 years to replace all water in the oceans.

The world’s water supply: Each image represents A major reservoir.

Distribution of Land and Water 70% of land on Earth is in the Northern Hemisphere - mostly at the middle latitudes. Southern hemisphere is the water hemisphere.

Oceans There are 5 major oceans: Pacific, Atlantic, Indian, Arctic and Southern

Pacific The largest ocean, covers 1/3 of Earth’s surface and 1/2 of the world’s ocean surface. It’s maximum width is 19,800 km from Indonesia to Columbia. Contains 25,000 islands, mostly just south of the equator.

Atlantic 2nd largest. 4 times more land drains into the Atlantic than into the Pacific or Indian Oceans. Only has a few islands.

Indian 3rd largest. 10,000 km wide from South Africa to Australia.

Arctic Smallest Located at North Pole. Water flows into and out of it from North Atlantic. Connected to Pacific by the Bearing Straight.

Southern Created in 2000 by International Hydrographic Organization. Located between 60ºS latitude and Antarctica.

Classwork Read Great Bodies of Water Answer Questions: Let’s Think it Through Exercises 1 and 2