Intro to Earth’s waters Hydrosphere Intro to Earth’s waters

What is the hydrosphere? The hydrosphere is ALL of the water on Earth Obvious Examples: Oceans, lakes, rivers, streams, creeks, seas, ponds, swamps/wetlands Not So Obvious Examples: clouds, underground reservoirs, glaciers, icebergs water in your body, water within plants

Water Distribution on Earth Open your books to C10 About how much of the Earth is covered by water?

Salt Water Salt water is water that contains dissolved salts and other minerals Example – ocean

Fresh Water Fresh water is water that is not salty and has little or no taste, color, or smell Examples – river, lakes, icebergs

Salt Water vs Fresh Water: The Facts! 97% is salt water 3% is fresh water So…out of all the fresh water, 70% is actually frozen or polluted. That leaves us with 30% that is free flowing or usable. BUT only 1% of that is safe enough to drink!

Water: Where Does It Come From? The Water Cycle

Evaporation When water changes from a liquid to a gas (water vapor) What makes the water evaporate?

Condensation When water changes from a gas (water vapor) to a liquid Give me an example of condensation…

Precipitation When water falls from clouds What are forms of precipitation?

Run-off/Accumulation When water moves from one location to another (run-off) and gathers there (accumulation) What else can the water do?

Transpiration Water vapor coming from trees and plants

Percolation Water soaking down into the ground through the soil

Questions???

What makes water so unique? Use page NC-21 in the back of the book to fill in the “Properties of Water” chart. Fill in the “Student Input” boxes ONLY, we will do the “Teacher Input” together. Once you finish, work on your EOG Review Booklet.

Polarity explains a lot! Oxygen = negative pole Hydrogen = positive pole Water is attracted to itself and other things like a magnet!! Why do the elements in water have a charge?

Cohesion Because water is polar, it sticks to itself!!

Adhesion Again, because water is polar it sticks to OTHER things too!!

Density…you already know this! Water is less dense as a solid than a liquid…that’s why ice cubes float!

Buoyancy Water’s ability to push back on objects allow them to float! (Has to do with surface area)

Specific Heat Water has a really high specific heat It takes a long time for water to heat up or cool down

Universal Solvent Water can dissolve more substances than anything else! Remember, the solvent does the dissolving and the solute is what dissolves!

Homework Work on your EOG Review Booklet – first check point coming soon!