CHAPTER. 3 Earth s Environmental Systems
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1 CHAPTER 3 Earth s Environmental Systems
2 The Gulf of Mexico s Dead Zone Nutrient-rich runoff causes plankton blooms and hypoxia low oxygen levels in the Gulf of Mexico. Hypoxia kills or displaces marine organisms, causing a decline in the fisheries and the fishing industry. U.S. government and farmers debate the need to cut down on fertilizer use. Talk About It Do you think the distance between the source of the nitrogen and phosphorus and the dead zones themselves makes it difficult to manage this problem? Why or why not?
3 Lesson 3.1 Matter and the Environment Water s abundance is a primary reason there is life on Earth.
4 Lesson 3.1 Matter and the Environment Atoms and Elements Atoms are the basic unit of matter. Nucleus: Contains protons and neutrons Electrons: Move around the nucleus An element is a substance that cannot be broken down into other substances. Did You Know? There are 92 elements that occur naturally, and scientists have created about 20 others in labs.
5 Lesson 3.1 Matter and the Environment Bonding Atoms combine by bonding: Covalent bonds: Electrons are shared. Ionic bonds: Electrons are transferred. Molecule: Two or more atoms joined by covalent bonds Compound: Substance composed of atoms of two or more different elements Covalent bonding Ionic bonding
6 Lesson 3.1 Matter and the Environment Organic and Inorganic Compounds Organic compounds: Consist of covalently bonded carbon atoms and often include other elements, especially hydrogen Hydrocarbons: Organic compounds, such as petroleum, that contain only hydrogen and carbon Inorganic compounds: Lack carbon-to-carbon bonds Organic compounds include natural gas, petroleum, coal, and gasoline.
7 Lesson 3.1 Matter and the Environment Solutions A mixture is a combination of elements, molecules, or compounds that are not bonded chemically. Solutions are mixtures in which all ingredients are equally distributed. Mixtures can be solids, liquids, or gases. Blood, sea water, plant sap, and metal alloys, such as brass, are all solutions.
8 Lesson 3.1 Matter and the Environment Macromolecules Large organic compounds that are essential to life Proteins: Serve many functions; include enzymes Nucleic Acids: Direct protein production; include DNA and RNA Carbohydrates: Provide energy and structure; include sugars, starch, and cellulose Lipids: Not soluble in water; many functions; include fats, waxes, and hormones
9 Lesson 3.1 Matter and the Environment Water is required by all living things for survival. Hydrogen bonding gives water many unique properties: Cohesion Resistance to temperature change Less dense when frozen Ability to dissolve many other molecules Water
10 Lesson 3.1 Matter and the Environment Acids, Bases, and ph The separation of water molecules into ions causes solutions to be acidic, basic, or neutral. The ph scale measures how acidic or basic a solution is. ph of 7 Neutral: Equal concentrations of H + and OH - ph below 7 Acidic: Relatively high concentration of H + ph above 7 Basic: Relatively high concentration of OH -
11 Lesson 3.2 Systems in Environmental Science Positive feedback loops can help erosion turn a fertile field to desert in just a few years. Dust storm, Stratford Texas, 1930s
12 Lesson 3.2 Systems in Environmental Science Interacting Systems Inputs into Earth s interconnected systems include energy, information, and matter. Feedback loops regulate systems. Negative feedback loops: Result in stabilization of a system Negative feedback loop Positive feedback loops: Result in a system moving to an extreme Did You Know? Predator-prey cycles are negative feedback loops. If prey populations rise, predator populations can rise in response, causing prey populations to fall. Then predator populations may decline, allowing prey populations to rise again, and so on.
13 Lesson 3.2 Systems in Environmental Science Spheres of Function Earth can be divided into spheres that are defined according to their location and function.
14 Lesson 3.3 Earth s Spheres The movement of Earth s plates has formed the deepest ocean trenches and the highest mountains.
15 Lesson 3.3 Earth s Spheres Crust: Thin, cool, rocky outer skin The Geosphere Rocks and minerals on and below Earth s surface: Mantle: Very hot and mostly solid Core: Outer core is molten metal, inner core is solid metal Rock formation, Ouray National Wildlife Refuge, Utah
16 Lesson 3.3 Earth s Spheres Plate Tectonics Crust and mantle are divided into: Lithosphere: Crust and uppermost mantle; divided into tectonic plates Asthenosphere: Soft middle mantle; heated by outer core Lower mantle: Solid rock Convection currents in the asthenosphere move tectonic plates. Collisions and separations of the plates result in landforms. Volcano lava
17 Lesson 3.3 Earth s Spheres Tectonic Plates There are three major types of plate boundary: Divergent Transform Convergent
18 Lesson 3.3 Earth s Spheres Divergent and Transform Plate Boundaries Divergent boundaries: Rising magma pushes plates apart. Divergent plate boundary Transform boundaries: Plates slip and grind alongside one another. Transform plate boundary
19 Lesson 3.3 Earth s Spheres Convergent Plate Boundaries Plates collide, causing one of two things to happen: Subduction: One plate slides beneath another. Mountain-building: Both plates are uplifted.
20 Lesson 3.3 Earth s Spheres The Biosphere and Atmosphere Biosphere: The part of Earth in which living and nonliving things interact Atmosphere: Contains the gases that organisms need, such as oxygen; keeps Earth warm enough to support life Earth s atmosphere, seen from space
21 Lesson 3.3 Earth s Spheres The Hydrosphere Consists of Earth s water Most of Earth s water (97.5%) is salt water. Only 0.5% of Earth s water is unfrozen fresh water usable for drinking or irrigation. Earth s available fresh water includes surface water and ground water. Greenlaw Brook, Limestone, Maine Did You Know? If it is depleted, groundwater can take hundreds or even thousands of years to recharge completely.
22 Lesson 3.3 Earth s Spheres The Water Cycle
23 Lesson 3.4 Biogeochemical Cycles A carbon atom in your body today may have been part of a blade of grass last year, or a dinosaur bone millions of years ago. Fossilized bones in a Colorado dig.
24 Lesson 3.4 Biogeochemical Cycles Nutrient Cycling Matter cycles through the environment. Matter can be transformed, but cannot be created or destroyed. Nutrients, matter that organisms require for life process, circulate throughout the environment in biogeochemical cycles. Did You Know? Organisms require several dozen nutrients, such as nitrogen, phosphorus, and carbon, to survive.
25 Lesson 3.4 Biogeochemical Cycles The Carbon Cycle
26 Lesson 3.4 Biogeochemical Cycles The Phosphorus Cycle
27 Lesson 3.4 Biogeochemical Cycles The Nitrogen Cycle
Lesson 3.1 Matter and the Environment. Water s abundance is a primary reason there is life on Earth.
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