d o n ow – i n n otebooks list some important properties or facts about water

DO NOW – IN NOTEBOOKSList some important properties or

facts about water.

STATISTICS Water covers 75% of Earth 60% of the human body is made up of water People in North America use ~106 gallons of

water every day Agriculture accounts for ~80% of water

consumption worldwide 97.5% of the earth's water is saltwater. If the

world's water fit into a bucket, only one teaspoonful would be drinkable.

Humans can live for up to a month without food, but only 2 days without water

Oceanography

WATER Essential Question:

Why is water essential to life on Earth?

Objectives:

Discuss and investigate properties of water

WATER FACTS Exists in solid, liquid

and gas forms Covers 70% - 75% of

Earth 4 Oceans: Pacific,

Atlantic, Indian, Arctic N. Hemisphere: 61% S. Hemisphere: 81% Average Depth:

3,800m

WATER FACTS 97% Saltwater 3% Freshwater Most freshwater

located in glaciers Sea Level

Level of ocean water

Varies due to melting of glaciers

WATER – PHYSICAL PROPERTIES Water is tasteless and odorless Water is transparent - light can pass through Water is a strong solvent, mixes well with

other substances (salt, sugar, CO2) Water is less dense as a solid than a liquid

WATER – PHYSICAL PROPERTIES Chemical Formula:

H2O Boiling temp:

100ºC Freezing temp:

0ºC Very high Specific

HeatTakes a lot of

energy to raise the temperature

WaterCycle

WATER CYCLE Evaporated from Earth’s surface Transpired from trees and plants Condensed into water droplets, forms clouds Precipitates back to Earth Runoff into large bodies of water, enters ground The cycle repeats

SO WHY IS WATER SO IMPORTANT?

Determines climate and weather Shapes the landscapes on Earth through

weathering and erosion Supports life on Earth (Plants and

Animals)Agriculture, Drinking

Form of energyHydroelectric power

Recreation Cleaning – shower, clothes

PROPERTIES OF WATERCohesion

Water molecules sticking together

AdhesionWater molecules sticking to

other substancesSurface Tension

Waters resistance to objects attempting to break through its surface