5th grade ch. 7 lesson 1 how can the oceans be described
TRANSCRIPT
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