Mexico City- Environ
The problem is made
worse by the geography
of the region.
• The city lies in a basin
surrounded by
mountains and frequent
thermal inversions trap
pollutants at ground
level.
1. Why do you think the
surrounding land would
make air pollution worse in
Mexico City?
Mexico City

Exactly what kind of weather conditions would a cold front produce?

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.

There are 4 red balls, 6 white balls, and 3 green balls in a bag. if one ball is drawn from the bag at random, what is the probability that it is not white?