January 22, 2015

The hydrosphere

January 22, 2015

What is the hydrosphere?

All water on earth- in the oceans, lakes, glaciers, rivers, streams, vapor, and underground

hydrosphere.mp4

January 22, 2015

Estimate! What percent of the earth do you think is water?

Let's take a random sample. Each time the ball is caught, we will record where the tip of your left thumb is: land or water.

water %

total 100=

January 22, 2015

How does water cover the earth? open textbook to page C-10How much of the earth is covered with water?

Draw a pie chart:

Most of the water is the ocean, but water that covers land could be:

January 22, 2015

January 22, 2015

What type of water do we drink? Where can you find it?

What kind of water is in the ocean?

Human beings and most animals cannot.........

January 22, 2015

Draw the glass of water and show what percent would be salt water and what percent would be fresh water.

What percent of freshwater is free flowing? What percent is frozen?

January 22, 2015

Here is a more detailed pie chart of the water on earth

January 22, 2015

Demo- If 1,000 mL of water represented all the water on earth....

*3% or 30 mL would be freshwater

*Salt goes in the other 97%

*Frozen water is located at the poles....close to 80%, so that's 24mL (30 x .8)

*So we will pour out 6mL ( 0.6%) of fresh water that isn't frozen. Only about 1.5 mL is surface water...the rest is underground

*Of this water, only .03mL is clean enough for us to drink!! That's one drop! (about .003%)

January 22, 2015

What is this water called that we can drink?

Potable Water

January 22, 2015

On a global scale this is 6 million liters per person, but.....

in some places water is plentiful and in other places water is scarce

January 22, 2015

Things we use potable water for.....

January 22, 2015

Why is the ocean salty?

Remember that water is the universal solvent

Chemicals that have eroded from the earth's crust have dissolved into the water

January 22, 2015

Where has it come from?

volcanoes, particles carried by the wind, sediment broken down on the ocean floor

January 22, 2015

How is salinity increased?

evaporation or freezing of sea ice

How is salinity decreased?

rainfall, runoff, melting of ice

January 22, 2015

What is a hydrothermal vent?

recently discovered features on the crest of oceanic ridges that release dissolved minerals into the ocean

*Water seeps into rocks of the ocean crust, gets heated, and flows back into the ocean

January 22, 2015

What comes out of a hydrothermal vent?

superheated water with large amounts of dissolved minerals

It is estimated that the entire ocean could seep through the vents in 10 million years!

Hydrothermal_Vents.mp4

January 22, 2015

How does the ocean affect the world's climate?

It collects, mixes, and heats water and carbon dioxide

Temperatures all over the world are regulated by the circulation of heat in the ocean

January 22, 2015

Why?

The ocean has a very high density and high specific heat

It is most noticeable near the equator and less noticeable near the poles

How_Do_the_Oceans_Affect_Our_Weather_and_Climate_.wmv

January 22, 2015