Astream has an elevation of 1,000 meters. it ends in a lake that has an elevation of 300 meters. if the lake is 200 kilometers away from the source, what is the average gradient of the stream?
gradient = change in value / change in distance

One of the brightest comets of the 20th century was comet hyakutake, which passed close to the sun in early 1996. the orbital period of this comet is estimated to be about 30,000 years. find the semi-major axis of this comet’s orbit. compare it to the average sun-pluto distance and to the distance to alpha centauri, the nearest star to the sun, which is 4.3 light-years distant.

How did geographic isolation affect the islands in the australasia ecozobne?

Are divergent boundaries responsible for tsunamis?