5th grade ch. 7 lesson 1 how can the oceans be described
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Transcript of 5th grade ch. 7 lesson 1 how can the oceans be described
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Ch. 7Ch. 7Lesson 1Lesson 1
How can the How can the oceans be oceans be described?described?
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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
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hydrhydroo
spheresphere
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hydrospherehydrosphere
•all the all the waters waters of of EarthEarth
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hydrospherehydrosphere
• almost all = almost all = ocean waterocean water
• only 3% in only 3% in other placesother places
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hydrospherehydrosphere
•covers covers 3/4 of 3/4 of Earth’s Earth’s surfacesurface
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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
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salinitysalinity•measurmeasure of how e of how salty salty water iswater is
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salinitysalinity•rivers meet ocean= rivers meet ocean= low salinitylow salinity
•warm areas= high warm areas= high salinitysalinity
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•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
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currents caused by:currents caused by:
1.1. windswinds2.2. cold, salty cold, salty
water sinking water sinking under warmer under warmer waterwater
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Equator
300 C
Poles
-20 C
Poles
-20 C
Gulf Stream current
California current
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ocean resources
ocean resources
tunatuna saltsalt magnesiummagnesium drinking water
drinking water