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definition: the variety of life on Earth, in all its forms, from genes and bacteria to entire ecosystems such as forests or coral reefs.

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sentence: there are many threats to the earth's biodiversity

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definition: the aboveground portion of a plant cropping or crop, formed by the collection of individual plant crowns.

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sentence: Trees arched over the road, forming a canopy of leaves.

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Definition: a flat, open area where grasses dominate the vegetation.

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Sentence: The grassland was very parched with few butterflies in flight.

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Definition: a biome of coniferous forests that covers a large part of Canada, Asia, and Europe

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Sentence: The taiga is an important source of timber and other resources.

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Definition: a large body of water surrounded by land.

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Sentence: This is such a huge lake!

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Definition: the amount of solar radiation reaching a given area.

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Sentence: In the annual cycle experiments, however, low winter insolation causes the seaways to freeze

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Definition:  a layer of the ocean that extends from 1,000–4,000 meters (3,300–13,100 feet) below the ocean's surface

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Sentence: The bathypelagic zone receives no sunlight and water pressure is considerable.

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Definition: The photic zone is the top layer of the ocean where sunlight can reach, and it is home to a wide variety of marine life.

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Sentence: Density was evaluated by sampling carried out within the photic zone

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Definition: formed by the action of the currents or waves of the sea

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Sentence: the pollution is causing damage to marine life

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Definition: a large naturally occurring community of flora and fauna occupying a major habitat, e.g. forest or tundra.

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Sentence: This is an area larger than most terrestrial biomes

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Definition: the long-term pattern of weather in a particular area.

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Sentence: The climate is changing

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Definition sentence:  a forest where most trees lose their leaves at the end of the growing season

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sentence: The deciduous forest looks scary at night

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Definition:  a low-lying area of land that is saturated with water for varying periods of time.

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Sentence: there is a lot of water in the wetlands

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Definition: a small body of still water formed naturally or by hollowing or embanking

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Sentence: They're lots of frogs in the pond

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Definition: Topography is the study of the forms and features of land surfaces. 

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Sentence: The topography of an area may refer to the land forms and features themselves

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Definition: the deepest layer of the ocean, extending from 4,000 to 6,000 meters (13,100 to 19,700 feet) below the surface.

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Sentence: The abyssal zone covers the abyssal plains between 4,000 and 6,000 m.

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Definition:  the area of a lake or ocean where there is little to no sunlight.

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Sentence: The Aphotic Zone is very dark

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Definition: microscopic algae that live in the upper layers of freshwater and marine environments.

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Sentence: The phytoplankton bloom in the lake every spring, which jumpstarts the lake's ecosystem.

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Definition: a land region on the earth's surface covered by biological communities that group under the same climatic patterns like rainfall and temperature.

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Sentence: Terrestrial biomes are land-based biomes

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Definition: a change or the process of change by which an organism or species becomes better suited to its environment.

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Sentence: The insect's evolutionary adaptations enable it to be almost invisible even when sitting in the middle of a leaf

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Definition: a grassy plain in tropical and subtropical regions, with few trees.

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sentence: Savannah is very dry

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Definition: a very large expanse of sea, in particular each of the main areas into which the sea is divided geographically.

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Sentence: The ocean is very deep

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Definition: the tidal mouth of a large river, where the tide meets the stream.

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Sentence: Five million years ago, a river estuary covered the area.

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Definition: the part of the ocean where there is enough sunlight for algae to utilize photosynthesis

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Sentence: The epipelagic zone is the uppermost layer of the ocean.

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definition: also known as the hadopelagic zone, is the deepest region of the ocean, lying within oceanic trenches. The hadal zone ranges from around 6 to 11 km below sea level, and exists in long, narrow, topographic V-shaped depressions.

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Sentence: The hadal zone spans from depths of to the ocean floor

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Definition:  areas with a dissolved salt concentration of less than 1%.

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Sentence: The freshwater zone is home to a variety of plants and animals.

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Definition:  water released from clouds in the form of rain, freezing rain, sleet, snow, or hail.

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Sentence: The precipitation increased rapidly

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Definition:  the living and the non-living entities of water bodies constituting diverse ecosystems.

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Sentence: The aquatic biome is the largest biome on Earth

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Definition: The tundra is a biome that is treeless and treeless plains. It is the coldest biome on Earth

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Sentence: The tundra has no trees

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Definition: are hot, wet biomes that receive the most rainfall of all biomes. They are located near the equator, where it is warm

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Sentence: The Tropical rainforest looks cool

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Definition:  a large body of fresh water that flows downhill due to gravity.

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Sentence: The river looks shallow

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Definition:  a permanently frozen layer of soil, gravel, and sand that remains at or below 0°C (32°F) for at least two years.

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Sentence: It's the nature of frost that after time it becomes permafrost

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Definition:  a layer of the ocean that extends from 200–1,000 meters (660–3,300 feet) below the surface. It's also known as the twilight zone or the middle pelagic zone.

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Sentence: The Mesopelagic Zone has many different creatures

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Definition:  the shallow area of a lake or pond where the water meets the land

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Sentence: I see the Littoral Zone at the beach

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Definition:  the dissolved salt content of a body of water.

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Sentence: The salinity in the water makes it easier for me to float

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Definition: Temperature is a physical quantity that quantitatively expresses the attribute of hotness or coldness. Temperature is measured with a thermometer.

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Sentence: "Your temperature is very high" The doctor said.