Presentation on theme: "Chapter 20 Table of Contents Section 1 Land Biomes"— Presentation transcript:
1 Chapter 20 Table of Contents Section 1 Land Biomes The Earth’s EcosystemsTable of ContentsSection 1 Land BiomesSection 2 Marine EcosystemsSection 3 Freshwater Ecosystems
2 Chapter 20Section 1 Land BiomesObjectivesDistinguish between abiotic factors and biotic factors in biomes.Identify seven land biomes on Earth.
3 The Earth’s Land Biomes Chapter 20Section 1 Land BiomesThe Earth’s Land BiomesAbiotic Factors Abiotic factors are *Biotic Factors Biotic factors are *Biomes A biome is a large area characterized by *
15 Chapter 20Section 1 Land BiomesTundraPolar Tundra In polar tundra, the layer of soil beneath the surface soil *.Alpine Tundra Alpine tundra also has permafrost. But alpine tundra is found at the top of tall mountains.
17 Chapter 20Section 2 Marine EcosystemsObjectivesList three abiotic factors that shape marine ecosystems.Describe four major ocean zones.Describe five marine ecosystems.
18 Life in the Ocean Chapter 20 Section 2 Marine EcosystemsLife in the OceanAbiotic Factors Marine ecosystems are shaped by abiotic factors including water temperature, water depth, and the amount of sunlight that passes into the water.Plankton Trillions of plankton live in the ocean. Plankton are *
19 Chapter 20Section 2 Marine EcosystemsTemperatureDepth and Temperature The temperature of ocean water *
20 Depth and Sunlight Chapter 20 Section 2 Marine EcosystemsDepth and SunlightThe Intertidal Zone The intertidal zone is the place where the ocean meets the land.The Neritic Zone As you move farther away from shore, into the neritic zone, the water becomes deeper.The Oceanic Zone In the oceanic zone, the sea floor drops sharplyThe Benthic Zone The benthic zone is the ocean floor. The deepest part does not get any sunlight.
23 A Closer Look Chapter 20 Intertidal Areas Intertidal areas are found * Section 2 Marine EcosystemsA Closer LookIntertidal Areas Intertidal areas are found *Coral Reefs Coral reefs are found in warm, shallow areas of the neritic zone. Reefs provide homes for many marine animals and plants.Estuaries * is called an estuary. Plants and animals living in estuaries must be able to survive in a changing concentration of salt.
24 A Closer Look, continued Chapter 20Section 2 Marine EcosystemsA Closer Look, continuedThe Sargasso Sea An ecosystem called the Sargasso Sea is found in the middle of the *.Polar Ice The Arctic Ocean and the ocean around Antarctica have icy waters, which are rich in nutrients. Many fishes, birds, and mammals live in this ecosystem.
25 Chapter 20Section 3 Freshwater EcosystemsObjectivesDescribe one abiotic factor that affects freshwater ecosystems.Describe the three zones of a lake.Describe two wetland ecosystems.Explain how a lake becomes a forest.
26 Stream and River Ecosystems Chapter 20Section 3 Freshwater EcosystemsStream and River EcosystemsWater in Streams and Rivers The water in brooks, streams, and rivers may flow from melting ice or snow. Or the water may come from a spring.Tributaries Each stream of water that joins a larger stream is called a tributary.
28 Pond and Lake Ecosystems Chapter 20Section 3 Freshwater EcosystemsPond and Lake EcosystemsLife near Shore * is called the littoral zone. The plants in the littoral zone are homes to small animals.Life Away from Shore The area of a lake or pond that extends from the littoral zone across the top of the water called the open-water zone. Beneath the open-water zone is *
30 Wetland Ecosystems Chapter 20 Section 3 Freshwater EcosystemsWetland EcosystemsMarshes * is called a marsh. Muskrats, turtles, frogs, and birds live in marshes.Swamps * is called a swamp. Water lilies and other plants grow in standing water. Many fishes, snakes, and birds also live in swamps.
31 From a Lake to a Forest Chapter 20 Section 3 Freshwater EcosystemsFrom a Lake to a ForestBuild Up of Sediments Water entering a standing body of water *Formation of a Wetland Over time, the pond or lake is filled with sediments. Plants grow in the new soil and the pond or lake starts becoming a wetland. The wetland then may develop into a forest.