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Droughta period of dryness especially when prolonged;specifically:one that causes extensive damage to crops or prevents their successful growth

Earthquake

A sudden and violent shaking of the ground, sometimes causing great destruction, as a result of movements within the earth's crust Tsunami

A tsunami is a large ocean wave usually caused by an underwater earthquake or a volcanic explosion.VolcanoA volcano is a landform (usually a mountain) where molten rock erupts through the surface of the planet.

Wildfire

anylargefirethatspreadsrapidlyandishardtoextinguish.EcosystemThe living and nonliving things in an environment

PopulationA group of the same organisms, such as a herd of deer

Speciesgroup of organisms that reproduces only with other members of their own group.

Examples:Grey SquirrelRed SquirrelBlack squirrel