# Wednesday, January 23 rd - PowerPoint PPT Presentation

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Wednesday, January 23 rd. What percent of the Earth is water? 97% 50% 85% 70%. 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.

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Wednesday, January 23 rd

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### Wednesday, January 23rd

What percent of the Earth is water?

97%

50%

85%

70%

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

## Ocean Properties

For each of the following determine whether you agree or disagree.

70% of the Earth is covered by water.

NaCl is the most abundant element in ocean water.

Gases in the water do not vary with depth.

The sun is the major source of heat for the ocean.

Warm water is more dense than cold water.

Salty water is less dense than fresh water.

Surface water is usually warmer than deep water.

For every 1000 grams of ocean water, 35 of those grams are salt.

Three sources of salt are – wind, waves, and water.

Salt water wants to sink below fresh water.

### Coffee Talk

Oceans Properties

### 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 Chemistry

Solids 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.

NOAA map of ocean's salinity.

Continents in gray

• Salinity varies based on

• 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).

### 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.

The ocean changes as you get deeper.

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.

http://www.nikon.co.jp/

Density also affects the ocean.

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 Properties

For each of the following determine whether you agree or disagree.

70% of the Earth is covered by water.

NaCl is the most abundant element in ocean water.

Gases in the water do not vary with depth.

The sun is the major source of heat for the ocean.

Warm water is more dense than cold water.

Salty water is less dense than fresh water.

Surface water is usually warmer than deep water.

For every 1000 grams of ocean water, 35 of those grams are salt.

Three sources of salt are – wind, waves, and water.

Salt water wants to sink below fresh water.