Explain why the lower mantle moves and how the rocks remain solid despite the extreme heat.

Describe the german immigrants in texas. why did they emigrate from germany to texas? what are some examples of their culture in texas?

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.

During which era in earth's history were the first insects? mesozoic precambrian cenozoic paleozoic