Presentation on theme: "Landforms, Water, and Natural Resources"— Presentation transcript:
1Landforms, Water, and Natural Resources World Geography Today4/13/2017CHAPTER 4Landforms, Water, and Natural ResourcesSection 1: LandformsSection 2: The HydrosphereSection 3: Natural ResourcesChapter 04
2Objectives: Section 1 Landforms What physical processes inside Earth built up the land?What physical processes on Earth’s surface wear down the land?How do these physical processes interact to create landforms?
3Plate tectonics create landforms: Section 1 LandformsPlate tectonics create landforms:Earth’s crust is made up of moving plates, which spread, collide, and slide laterally past each other.Spreading plates form oceanic ridges undersea and rift valleys on land.Colliding plates cause trenches and volcanoes undersea and mountains on land.Plates sliding laterally cause fractures and earthquakes.
4Forces on Earth’s surface: Section 1 LandformsForces on Earth’s surface:Weathering and erosion shape the land.weathering—slow and hard to detect; includes chemical and physical processeserosion—movement of surface material—by water, wind, and ice—wears down land
5Tectonics and surface forces interact: Section 1 LandformsTectonics and surface forces interact:Landforms are created through a combination of forces.For example, a mountain range is formed by tectonics, then weathered and eroded to create valleys, alluvial fans, deltas, and other landforms.
6Objectives: Section 2 The Hydrosphere In what forms and where do we find water on Earth?What are the causes and effects of floods?
7Water on Earth: Section 2 The Hydrosphere Forms saltwater—97 percent of world’s waterfreshwater—most frozen in ice caps; less than 1 percent in vapor and liquid formWhere liquid fresh water is foundsurface water—in rivers, lakes, estuaries, wetlandsgroundwater—stored in soil and water table
8Floods: Section 2 The Hydrosphere Causes—heavy rains, sudden snow melts; human activity may contributeEffects—erosion, loss of vegetation, death and destruction
9Objectives: Section 3 Natural Resources Why are soil and forests important resources?What are the concerns about water quality and air quality?What are some of the ways minerals are used?What are the main energy resources, and how are they used?
10Importance of soil and forests: Section 3 Natural ResourcesImportance of soil and forests:Soil is crucial for food production.Forests protect soil from erosion, provide species habitats, and yield useful products.
11Concerns about air and water quality: Section 3 Natural ResourcesConcerns about air and water quality:air pollution—threatens air supply, creates acid rain, damages the ozone layer, may contribute to global warmingwater pollution— threatens clean water supply, contributes to shortages
12Minerals Section 3 Natural Resources Minerals are used in many processes and products, including construction, jewelry, and manufacturing.Examples: building materials, airplanes, cans, glass.
13Energy resources Section 3 Natural Resources Energy resources include fossil fuels—coal, natural gas, petroleum—and uranium.Uses:uranium—energy for nuclear powercoal—heat source; power for steam engines, mills, electricity generation; dye makingpetroleum—lamp fuel; gasoline, diesel and heating fuel; asphalt, petrochemicalsnatural gas—home and industrial heating; fuel