By Donna Latham
Investigating the planet's biomes and interpreting the trendy threats to every environment, this interactive sequence demanding situations younger readers to examine how their very own activities impression the planet's overall healthiness. With compare-and-contrast evidence and vocabulary-building sidebars, every one enticing advisor unearths how environmental threats—both human and natural—affect crops and animals.
Evaluating the coldest biome, this source examines how the residing issues present in the tundra coexist harmoniously with the cruel panorama. Explaining how environmental switch threatens existence during this biome, this instructive advisor leaves readers with a better realizing of the significance of conservation and upkeep efforts.
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Extra info for Tundra
Sample text
Words to Know Northern Hemisphere: the half of the earth north of the equator. timberline: also called the treeline. How far north or how high in the mountains trees grow. The tundra has a layer of permanently frozen soil called permafrost. When the weather warms up in the summer, the very top layer of the permafrost thaws. This top layer is called the active layer. The rest remains frozen. It never defrosts. ” When the active layer melts, it supplies a rich ecosystem for animals, plants, and insects.
Did You Know? The Arctic tern migrates the longest distance of any bird—21,750 miles (35,000 kilometers), from the Arctic to Antarctica and back again! The journey takes about 3 months. Environmental Threats Today, the tundra faces many threats. Oil drilling causes air, land, water, and noise pollution. The tundra is a sensitive environment. Buildings, roads, and pipelines put pressure and heat on the landscape, melting the permafrost. Oil spills are disastrous, ruining the environment and killing animals on land and in the water.
Large predators, including wolves and polar bears, are carnivores that eat caribou, seals, and other animals. Other animals stay outside and brave the elements. Polar bears, seals, and walruses depend on blubber and thick coats to protect them against the cold, both on the land and in the water. Words to Know migrate: to move from one environment to another when seasons change. predator: an animal that hunts another animal for food. subnivian layer: the area below a layer of snow and above the soil.
