Ch. 7Ch. 7Lesson 1Lesson 1

How can the How can the oceans be oceans be described?described?

Activity-How much salt Activity-How much salt does it take to make an does it take to make an

egg float?egg float?I predict that it will take ____ I predict that it will take ____ tsp. of salt to make the egg tsp. of salt to make the egg

float.float.Amount of salt Amount of salt (tsp)(tsp)

ResultResult

hydrhydroo

spheresphere

hydrospherehydrosphere

•all the all the waters waters of of EarthEarth

hydrospherehydrosphere

• almost all = almost all = ocean waterocean water

• only 3% in only 3% in other placesother places

hydrospherehydrosphere

•covers covers 3/4 of 3/4 of Earth’s Earth’s surfacesurface

ocean sizeocean size

from from biggestbiggest smallestsmallest1.1. Pacific OceanPacific Ocean

(biggest & deepest)(biggest & deepest)2.2. Atlantic OceanAtlantic Ocean3.3. Indian OceanIndian Ocean

4.4. Southern OceanSouthern Ocean 5.5. Arctic OceanArctic Ocean

salinitysalinity•measurmeasure of how e of how salty salty water iswater is

salinitysalinity•rivers meet ocean= rivers meet ocean= low salinitylow salinity

•warm areas= high warm areas= high salinitysalinity

•oceans get oceans get saltsalt (sodium chloride)(sodium chloride) from from riversrivers

•rivers dissolve salt rivers dissolve salt from rocks & soilfrom rocks & soil

sodium chloride= table salt

currents caused by:currents caused by:

1.1. windswinds2.2. cold, salty cold, salty

water sinking water sinking under warmer under warmer waterwater

Equator

300 C

Poles

-20 C

Poles

-20 C

Gulf Stream current

California current

ocean resources

ocean resources

tunatuna saltsalt magnesiummagnesium drinking water

drinking water