Presentation on theme: "Earth as a System. The Water Cycle Advances in technology have allowed scientists to study the Earth in a variety of different ways. Submersible Seismometer."— Presentation transcript:
Two Types of Systems 1.Closed System: Energy may enter and leave, but matter does not. (examples?) 2.Open System: System and its surroundings freely exchange both matter and energy. (examples?) What is the Earth? Take time to fill out your Venn Diagram and answer this Q.
Cycles and the Earth A Cycle is a series of steps that repeats. Some cycles (water cycle) repeat over relatively short periods of time, while others repeat over millions of years (tectonic cycle). On Earth, the water cycle, energy cycle, carbon cycle, tectonic cycle and rock cycle “work” together to maintain a dynamic planet.
Cloud diagram. Each group will make a poster showing the TEN different cloud types.Each group will make a poster showing the TEN different cloud types. Should include a picture (using color) of the cloud, the height the clouds form, and the type of weather involved.Should include a picture (using color) of the cloud, the height the clouds form, and the type of weather involved. Be neat! Be creative!Be neat! Be creative! –Sloppy work = reduced grade.
The Carbon Cycle Biogeochemical cycle- compound is changed and moved throughout the Earth’s spheres Carbon is commonly called the “building block of life” Carbon is not just a solid- it forms gases such as CO2 and Methane
Carbon Into the Atmosphere Living things breathe it out Carbon based things (i.e. trees) burn Diffuses out of oceans Volcanoes erupt– Number 1 source of CO2 into the atmosphere
Carbon From the Atmosphere Oceans dissolve 40% of CO2 in the atmosphere from fossil fuels Wave action dissolves CO2 into ocean Photosynthesis- plants breathe it in, and breathe out oxygen (phytoplankton do this in ocean water)
Other ways CO2 is shared… Carbon stored in plants is passed on to another organism when eaten (food chain) Organisms die and decomposition puts carbon into the ground creating fossil fuels (oil, coal, etc.)
The Energy Cycle (Energy Budget) Water and carbon Cycles are like wheels Energy Cycle is like a balance –Energy that comes in must equal the energy that comes out
What would happen if the Earth’s energy budget was not balanced?
Scenario #1 Too much energy enters the Earth system and not enough leaves…
Scenario #2 Too much energy leaves the Earth system and not enough enters…
Sources of Earth’s Energy 1.Solar energy- 99.895 % 2.Geothermal energy- 0.013 % 3.Tidal energy- 0.002 %
Solar Energy Comes from nuclear fusion reactions in the sun Drives wind, ocean currents, waves Source of energy that causes rocks to weather forming soil
Geothermal Energy Comes from the Earth as radioactive materials decompose Drives the movement of the continents, powers geysers, earthquakes, and volcanoes
Tidal Energy The result of the pull of the moon on the Earth’s oceans Slows down Earth’s rotation and causes the oceans to bulge
about 40% is reflected back into space without being changed the remaining energy is used within the Earth system as it moves through the system, it is changed. With every change, a little is lost to the system.
The Effects of Earth’s Surface Albedo is the percentage of energy that is reflected back into space without being changed Earth’s average albedo: 30% Forest has low albedo: 5-10% Desert has high albedo: 50% Fresh snow: 80-90%
Humans can alter the albedo of an area, which affects the Earth’s energy budget We can burn fossil fuels which puts CO2 in the air, or plant trees, which takes CO2 out of the air Damming a river lengthens the amount of time it takes water to go through the water cycle
Why Study Earth Science? 1.Resources, Economics 2.Hazards 3.Human sustainability 4.Engineering 5.Military 6.Pure Science and Understanding
PhysicsBiology Chemistry Astronomy Oceanography MeteorologyHydrology The Earth Sciences Geology “Earth Science informs all other sciences”
And, finally, simply to understand the nature of our own back yard.