What percent of the Earth is water?

a.97% b.50% c.85% d.70%

Wednesday, January 23rd

Test Answers

Salt Water Vocab sheet

DUE MONDAY, FEBRUARY 4TH

Tic-tac-toe You pick the three activities you

want to do.They can be across, diagonal, or

up and down. To help you with time

management, I’ve listed the dates for each activity.

I will give you guidelines for each activity as we go

Please ask questions along the way

Ocean PropertiesFor each of the following determine whether you

agree or disagree.1. 70% of the Earth is covered by water.2. NaCl is the most abundant element in ocean water.3. Gases in the water do not vary with depth.4. The sun is the major source of heat for the ocean.5. Warm water is more dense than cold water.6. Salty water is less dense than fresh water.7. Surface water is usually warmer than deep water.8. For every 1000 grams of ocean water, 35 of those

grams are salt.9. Three sources of salt are – wind, waves, and water.10.Salt water wants to sink below fresh water.

Oceans Properties

Coffee Talk

The World’s Ocean

70% of the Earth is covered by water.

97% of the Earth’s water is in oceans.

The sun plays a key role in the water cycle.

What elements and compounds are in the ocean besides water

(H2O)?

Properties of the Ocean

Ocean water is about 96% pure water or H₂O. The most abundant elements in ocean water are hydrogen (H) and oxygen (O). The other 2 most abundant elements are chlorine and sodium.

Oceanographers are scientists who study the ocean.

Ocean ChemistrySolids in Ocean Water

Sodium Chloride (NaCl) is the most abundant salt.

Salinity is the amount of dissolved salts in ocean water

Three sources of salt are – Volcanic activity, waves, and erosion

Salinity For every 1000 grams of

ocean water, 35 of those grams are salt (3.4% of mass). This means that 100 pounds of ocean water would contain 3.5 pounds of salt.

Why is the ocean salty? Water that moves across the earth dissolves the salt and carries it to the ocean. When water evaporates from the ocean, it leaves the salt behind.

Salinity varies based on

1. Temperature and evaporation of water. When water evaporates, it leaves the salt behind making the water saltier (orange). 2. Closeness to a “fresh” water source like a river

or icebergs causes low salinity (blue).

Continents in gray

Gases in Oceans

Most abundant gases in the ocean are nitrogen, carbon dioxide, and oxygen.

Gases vary with depth, more are at the surface.

Temperature & Pressure of the Ocean

Sun is the major source of heat for the ocean. Warm water is less dense than cold water. As you go deeper, the temperature drops. Surface water is usually warmer than deep water Pressure of the water increases with depth because more

water is on top. Salty water is more dense than fresh water. That means

that salty water wants to sink below fresh water. Cold water is more dense than warm water. That means

that cold water wants to sink below warm water. These properties cause water to want to move around.

This affects currents.

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Less light so the living things must be able to live without light.

More pressure due to the weight of the water above.

It usually gets colder the deeper you go.

Salty water is more dense than fresh water. That means that fresh water will “float” on top of salty water and not mix well.

Cold water is more dense than warm water. That means that warm water will “float” on top of cold water.

Both these facts make water want to move. If cold water moves on top of warm water, the difference in density will make them slowly switch places. This causes currents.

Ocean PropertiesFor each of the following determine whether you

agree or disagree.1. 70% of the Earth is covered by water.2. NaCl is the most abundant element in ocean water.3. Gases in the water do not vary with depth.4. The sun is the major source of heat for the ocean.5. Warm water is more dense than cold water.6. Salty water is less dense than fresh water.7. Surface water is usually warmer than deep water.8. For every 1000 grams of ocean water, 35 of those

grams are salt.9. Three sources of salt are – wind, waves, and water.10.Salt water wants to sink below fresh water.