Compare and contrast the richter scale and the moment magnitude scale

Mercalli scale-was developed to rate earthqukes according to the level of damage at the given place. Richter scale-a rating of an earthquake's magnitude based on the size of the earthquake's seismic waves.Moment magnitude scale-a rating system that estimates the total energy released by an earthquake.

The answer is a: the eggs have half as many chromosomes as the body cells

The soviet union beat the us to the first successful launch, with the october 4, 1957, orbiting of sputnik 1, and later beat the us to have the first human in earth orbit, yuri gagarin, on april 12, 1961. the "race" peaked with the july 20, 1969, us landing of the first humans on the moon with apollo 11