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