What do you think would happen to life on Earth if Earth was hit by a large (1 km or bigger) asteroid or comet?
What will be an ideal response?
Sixty-five million years ago, at the end of the Cretaceous period, more than 75 percent of the species on Earth, including the dinosaurs, became extinct due to a large impact that altered Earth's climate. If an object larger than 1 km was to hit the Earth, organisms near the impact would die instantly. An impact at sea would generate tsunamis hundreds of meters high and would travel around the world and flood the continents. On land, ejecta from the impact would fall back to Earth and produce a rain of hot meteorites, triggering forest fires and grass fires. Ash and dust in the atmosphere could block out the Sun for years, killing off plants because they require sunlight for photosynthesis.
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The color of a firework comes from the glowing of
A) molecules. B) atoms. C) gun powder. D) laser light.
Some lakes are "naturally acidic." How can that be possible?
What will be an ideal response?
Force on a Moving Charge: A proton travels at a speed of 5.0 × 107 m/s through a 1.0-T magnetic field. What is the magnitude of the magnetic force on the proton if the angle between the proton's velocity and the magnetic field vector is 30°? (e = 1.60 × 10-19 C)
A. 2.0 × 10-14 N B. 4.0 × 10-14 N C. 2.0 × 10-12 N D. 4.0 × 10-12 N
Which of the following are true concerning Hubble's Law?
A. Hubble's Law can be explained as a consequence of an expanding universe. B. The Hubble constant is not constant over time. C. Hubble's Law experimentally confirmed the prediction of Lemaitre. D. Hubble's Law shows that we are at the center of the universe.