Chapter 2 Notes Earth as a System Foldable

Chapter 2 Notes Earth as a System

Foldable Use 5 sheets of paper to make a booklet for this chapter

Table of Contents On inside of front cover: number pages using front and back of page Pg. Pg. 1 -Earth Basics 2 -Earth’s Interior 3 -Compositional Zones 4 -Structural Zones 5 -Earth as a Magnet 6 -Gravity and the Earth 7 -Earth System 8 -Earth’s 5 Spheres 9 -Energy Budget 10 -Nitrogen Cycle 11 -Carbon Cycle 12 -Phosphorous Cycle 13 -Water Cycle 14 -Ecosystems 15 -Energy Pyramid and Food Webs 16 -People and the Earth

Earth Basics-watch Brain Pop: Earth v third planet from the sun v about 4. 6 billion years old and is made mostly of rock. v about 71% of Earth’s surface is covered by a thin layer of water (global ocean). v an oblate spheroid, or a slightly flattened sphere. Earth’s pole-to-pole circumference is 40, 007 km. Its equatorial circumference is 40, 074 km. v average diameter is 12, 756 km.

Earth’s Interior � Scientists use seismic waves to learn about the interior (earthquakes or explosives) � three major compositional zones and five major structural zones. � Brain POP: http: //www. brainpop. com/science/earthsyste m/earthsstructure/

Compositional Zones- watch Brain POP � crust the thin and solid outermost layer of Earth above the mantle � Oceanic crust, which lies under the oceans, is only 5 to 10 km thick. (younger, thinner) � The continental crust varies in thickness from 15 km to 80 km. (older, thicker) � mantle in Earth science, the layer of rock between Earth’s crust and core- nearly 2, 900 km thick and makes up almost two-thirds of Earth’s mass.

Compositional Zones � core the central part of Earth below the mantle-composed of nickel and iron, radius is about 3, 500 km.

Compositional Zones See TB pg. 30

Structural Zones five structural zones § lithosphere the solid, crust and the rigid upper part of the mantle, 15 to 300 km thick. § asthenosphere the solid, plastic layer of the mantle beneath the lithosphere; made of mantle rock that flows very slowly, which allows tectonic plates to move on top of it, about 200 to 250 km thick.

Structural Zones five structural zones § Mesosphere-the “middle sphere”; the strong, lower part of the mantle between the asthenosphere and the outer core, thickness of about 2, 900 km. § Below the mesosphere is the liquid outer core. § The outer core surrounds the solid inner core, which begins at a depth of 5, 150 km.

Earth as a Magnet � Earth’s magnetic field extends beyond the atmosphere and affects a region of space called the magnetosphere � Scientists think that motions within the liquid iron of Earth’s outer core produce electric currents that in turn create Earth’s magnetic field.

Gravity and the Earth � Gravity -force of attraction that exists between all matter in the universe. � depends on the masses of the objects and the distance between the objects. (Newton’s law of gravitation) (so the larger the masses of two objects and the closer together that the two objects are, the greater the force of gravity between the objects will be)

Gravity and the Earth � Weight is a measure of the strength of the pull of gravity on an object. � Weight is a force � An object’s weight depends on its mass and its distance from Earth’s center. � (Interesting note: Because the distance between Earth’s surface and its center is greater at the equator than at the poles, the weight of an object at the equator is about 0. 3% less than its weight at the North Pole. )

Earth System � Matter space. � Energy is anything that has mass and takes up is defined as the ability to do work. (Energy can be transferred in a variety of forms, including heat, light, vibrations, or electromagnetic waves. ) � A system can be described by the way that matter and energy are transferred within the system or to and from other systems.

Earth System Open Systems � An open system is a system in which both energy and matter are exchanged with the surroundings. Closed Systems � A closed system is a system in which energy, but not matter, is exchanged with the surroundings.

Earth System

Earth System � Technically, all systems that make up the Earth system are open, but matter exchange is limited. � Energy enters the system in the form of sunlight and is released into space as heat. � Note: Only a small amount of dust and rock from space enters the system, and only a fraction of the hydrogen atoms in the atmosphere escape into space.

Earth’s FIVE Spheres The Atmosphere The Hydrosphere The Cryosphere The Biosphere The Geosphere

Earth’s FIVE Spheres The Atmosphere: Ø a mixture of gases that surrounds a planet, moon, or other celestial body Ø provides the air you breathe Ø shields Earth from the sun’s harmful radiation

Earth’s FIVE Spheres The Hydrosphere � the portion of the Earth that is water � 97% of this water is contained in the salty oceans. The remaining 3% is fresh water.

Earth’s FIVE Spheres The Cryosphere Ø Frozen form) water on the Earth (water in solid Ø Glaciers, icebergs, snow

Earth’s FIVE Spheres The Geosphere � mostly � Rock, earth. solid, rocky part of the Earth soil, solid and liquid rock layers of

Earth’s FIVE Spheres The Biosphere � includes all of the living organisms on Earth � (The biosphere is composed of all of the forms of life in the geosphere, in the hydrosphere, and in the atmosphere, as well as any organic matter that has not decomposed). � extends from the deepest parts of the ocean to the atmosphere a few kilometers above Earth’s surface.

Energy Budget � The transfers of energy between Earth’s spheres can be thought of as parts of an energy budget. � Energy cannot be created or destroyed (1 st Law of Thermodynamics) � Energy becomes less organized over timespreads out (2 nd Law of Thermodynamics) � The constant exchange of matter and energy between Earth’s spheres happens through chemical reactions, radioactive decay, the radiation of energy, and the growth and decay of organisms.

Energy Budget

Cycles on Earth � Nitrogen � Carbon � Phosphorous � Water

Cycles: Carbon /Oxygen Nitrogen Phosphorous Where Found How used Key Words in the Cycle Water

Water Cycle � Continuous movement of water � Where is water stored? � Key Terms include: evaporation transpiration condensation precipitation

Carbon Cycle Ø Where is carbon stored? Ø Key Terms: Combustion Long term cycle Short term cycle Photosynthesis Respiration Ø Ø Carbon is an essential element for all living things Moves through all of the Earth’s spheres Enters atmosphere as CO 2 Brain POP: http: //www. brainpop. com/science/earthsystem/carboncycle/

Carbon Cycle

Nitrogen Cycle � Nitrogen in air-soil-plants and animals � Nitrogen is removed from air mainly by the action of nitrogen-fixing bacteria in the soil. � Key Terms: Nitrogen fixation Bacteria Lightning Brain POP: http: //www. brainpop. com/science/earthsyste m/nitrogencycle/

Nitrogen Cycle

Phosphorous Cycle � Does not move through the atmosphere-P is rarely a gas � Sources of Phosphorous: break down of rock, animal waste � Plants take up P-pass it to animals when plant is eaten � Key Terms: Decomposition Weathering Runoff

Ecosystems-Transfer of Energy � Biotic and abiotic components � Can be small or large � Contain producers, consumers and decomposers Carrying Capacity: the largest population that an environment can support

Food Webs � Watch the Brain POP on Food Webs � Shows energy transfer � Food webs are more complex than food chains � Photosynthesis is used by plants (producers) to make their own chemical energy from sunlight � Arrows in food web indicate the direction of energy transfer

Food Webs

Draw a food web for the following organisms � Frog � Mouse � Eagle � Snake � Grasses � Grasshopper � Ant Which are herbivores? Carnivores? Omnivores? What is the difference between a food web and a food chain?

Energy Pyramid � Watch the Brain POP on the Energy Pyramid � Energy is lost as you move up the pyramid-10% of the enrgy is transferred through the food web to the next level

Energy Pyramid � Draw a food pyramid for the food web that you constructed.

People and the Earth � People can change the Earth by altering ecosystems, introducing pollutants into the environment and overuse of resources.

Conservation of Mass Lab Analysis questions: (record in your notebook under your data table) 1) Did we find mass or weight of our materials in this lab? 2) What is the difference between mass and weight? 3) Which trial represents an open system? Which trial represents a closed system? Explain 4) Compare the change in mass you calculated between Trial 1 and Trial 2. 5) Do both trials follow the law of conservation of mass? Explain 6) What are some possible sources of error in this activity?

Earth System