is a natural phenomenon; if left alone, the Earth's climate fluctuations are minor, and deserts and nondeserts remain constant. b. increases with increasing human population. c. is a geologically slow process; it takes hundreds of years to occur. d. occurs in only less-industrialized regions of the world.

Aschool principal ordered 1,000 pencils. he gave an equal number to each of 7 teachers untill had given out as many as possibe. how many pencils were left?

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.

Why did the people of kamchatka oppose a mining project there