The life-forms of the biosphere are located in the
a) geosphere only
b) hydrosphere and atmosphere only
c) atmosphere, hydrosphere, and geosphere
d) hydrosphere only

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.

Briefly describe in your own words the pros and cons of the changes people have made to the land in south florida.

What formation was created by glaciers in the last ice age