Aim: Why is water such an important molecule? Do Now: What elements make up water? Homework: read pages 4-9 in your book and answer any questions on those pages

The roles of water on earth Water influences weather- rain, sleet, snow Water shapes the surface of the earth- water wears away rock

Water supports life- nearly all biochemical reactions need water, water regulates temperature and helps transport substances Water supports human activities- bathing, cleaning, agriculture

Water is a polar molecule Water is made up of the elements hydrogen and oxygen Polarity- charges on parts of a molecule, molecules of water attract one another

Properties of water Cohesion- water molecules stick together Adhesion- water molecules stick to other surfaces

Aim: Why is water such an important molecule? Do Now: What does the word cohesion mean? Homework: Read pages 18-20 in your book and answer any questions

Properties of water It can absorb large amounts of energy- high specific heat It dissolves many other things- universal solvent

The Water Cycle Movement of water between the atmosphere, land, oceans, and living things makes up the water cycle

Practice: Read and complete page 15-17 in your book

Aim: How does water change state? Do Now: What are the three states of matter? Homework: complete page 25 in your book

Key terms Evaporation- when liquid water changes into water vapor Transpiration- the release of water vapor into the air by plants Sublimation- when solid water changes directly into water vapor

Condensation- change of state from a gas to a liquid Precipitation- any form of water that falls to the earth from the clouds Runoff- water flowing downhill into river, lakes, and oceans

Infiltration- water seeping into the ground Practice- complete page 22 with the key terms from the lesson today

Aim: How can we practice with the water cycle? Do Now: Why does evaporation occur? Homework: page 45 in your book