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Conservation Status Categories

Countries by Population Density

Global Recycling Symbols

Historical Climate Change Events

Key Geological Periods

Island Nations

Major Tectonic Plates

Ocean Currents and their Effects

Plate Tectonics: Types of Boundaries

Oceanography: Ocean Layers

Types of Biomes

World's Longest Mountain Ranges

World's Largest Lakes

Water Cycle Stages

Renewable and Non-renewable Resources

Significant Deserts of the World

Significant Coral Reefs

Conservation Status Categories

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Vulnerable (VU)

IUCN Criteria: High Risk of Extinction in the Wild

Extinct (EX)

IUCN Criteria: No Reasonable Doubt that the Last Individual has Died

Near Threatened (NT)

IUCN Criteria: Close to Qualifying for Vulnerable

Endangered (EN)

IUCN Criteria: Very High Risk of Extinction in the Wild

Critically Endangered (CR)

IUCN Criteria: Extremely High Risk of Extinction in the Wild

Extinct in the Wild (EW)

IUCN Criteria: Known Only to Survive in Cultivation, in Captivity or as a Naturalized Population

Least Concern (LC)

IUCN Criteria: Not Qualifying for Critically Endangered, Endangered or Vulnerable

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