Presentation on theme: "Chapter 3 Section 3 OBJECTIVES:"— Presentation transcript:
1Chapter 3 Section 3OBJECTIVES:Identify major processes in water cycle.Describe properties of ocean water.Discuss factors that allow life in the biosphere.KEY TERMS:Water cycleSalinityBiosphere
2The Hydrosphere All the water on or near Earth’s surface. Oceans, lakes, rivers, wetlands, polar ice caps, soil, and clouds.
3The Water CycleContinuous movement of water from Earth to atmosphere and back to Earth.
4The Water Cycle - Evaporation Water continually evaporates from Earth.Majority of water evaporates from oceans.Transpiration – water released from plants.
5The Water Cycle - Condensation Water vapor forms droplets on dust particlesParticles form clouds (droplets collide to create larger, heavier drops)
6The Water Cycle - Precipitation Drops of water fall to Earth as precipitation.Rain, snow, sleet, hail
7The Water Cycle - Collection Water falls back to Earth and gathers in lakes, rivers, streams, oceans
8Ocean Water - SalinitySalinity - amount of dissolved salt in a liquid.Lower in areas with lots of rain or where fresh water flows in to the sea.Higher where water evaporates rapidly (leaves salt behind).
9Temperature ZonesWhy is the surface of the ocean warm and the depths of the ocean cold?Ocean surface is warmed by the sun.Depths of the ocean are very cold.
10Global Temperature Regulator Oceans absorb and store solar radiation - regulates atmospheric temperatures.Oceans absorb and release heat slower than landWithout regulation of temperatures life could not exist on Earth.
11A Global Temperature Regulator Currents circulate warm waterCauses land areas they flow past to have moderate climates.
12Surface CurrentsMovements of water at or near the surface of the ocean.What drives (causes) these currents?Wind-driven (from global wind patterns).
13Fresh WaterFresh water - water that contains insignificant amounts of salts.Most fresh water is in icecaps and glaciers.
14Ground water Water in ground Replenished by rain and melting snow. 1% of water on Earth.
15AquifersA rock layer that stores and allows the flow of groundwater.
16The Biosphere Area on Earth where life exists. Located on or near Earth’s surfaceWhy is biosphere on or near Earth’s surface?Sunlight is available near the surface.Plants need sunlight to produce foodmost other organisms use plants and algae for food.Other Factors: Water, Moderate Temperatures
17Energy Flow in the Biosphere Energy used by organisms is obtained in the biosphere.Organism dies, body decays and nutrients in it are available for other organisms.This flow of energy allows life on Earth to continue to exist.
18Energy Flow in the Biosphere Matter does not enter or leave Earth but energy doesenergy comes from the sun.energy travels from plant to animal.energy is lost to space as heat.