What are some of the dangers that volcanoes pose to human populations?
a. destruction of property from lava flow
b. destruction from mud flows
c. lung problems from ash and toxic gases
d. all of the above

The correct answers are:

a. destruction of property from lava flows;

Not all of the volcanoes have eruptions that result in lava flows, but the ones that do can have devastating effects. The lava flows are very hot, they move downhill, and are able to destroy pretty much everything on their way. Luckily, the damage is almost always material, and loss of human lives is extremely rare because the lava flows move relatively slowly.

c. lung problems from ash and toxic gases;

Volcanoes tend to release huge amounts of ash and other toxic gases into the atmosphere. This can change the composition of the air in the surrounding are very quickly, and can cause lots of problems with the respiratory organs, and even be fatal in some cases.

they are both the same distance away from the equator and from the poles. both circles are at 66 1/2 degrees. also they both form imaginary line borders of polar regions.