Asteroid shock: 'City-sized' space rock NOT volcano destroyed

ASTEROID experts finally have conclusive proof a space rock strike not a volcanic eruption was responsible for dinosaurs

The sky is falling: The truth about doomsday asteroids

Suppose an asteroid 1000 km wide were on an earth-impacting trajectory, what size of it would eventually hit the earth after burning in the atmosphere? - Quora

Equilibrium/Sustainability — Scientists: World isn't prepared for volcanic eruption

Meteorites, Impacts, & Mass Extinction

Notable Asteroid Impacts in Earth's History

Shock and thaw? Earth's oldest asteroid impact may have helped lift the planet out of a deep freeze, Science

Global Volcanism Program

Could an asteroid be as big or bigger than Earth? - Quora

NASA Simulated an Asteroid Impact, Couldn't Avoid a Crash in Europe

A Post-Impact Deep Freeze for Dinosaurs - Eos

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