7. the diagram shows the pacific ring of fire. earthquakes and volcanic activity occur along the ring of fire.
which of the following best explains why?
a. it is located at the boundaries of tectonic plates.
b. it is located at the boundary of deep and shallow water.
c. it is located where major ocean currents meet.
d. it is located where ocean temperature is the highest.

5 structural isomers

the isomers are:

n-exane :   ch3ch2ch2ch2ch2ch3

2-methylpentane :   ch3ch(ch3)ch2ch2ch3

3-methylpentane :   ch3ch2ch(ch3)ch2ch3

2,3-dimethylbutane :   (ch3)2chch(ch3)2

2,2-dimethylbutane :   (ch3)3cch2ch3

a basic emergency supply kit could include the following recommended items: water - one gallon of water per person per day for at least three days, for drinking and sanitation. food - at least a three-day supply of non-perishable food. battery-powered or hand crank radio and a noaa weather radio with tone alert.