How can a valley glacier form in an area that is tropical or subtropical?

Question

i need this answer for science i have been looking for the answer for 2 hours!!!

Answer 1

The world has gone through some significant changes in temperature during the last 100 thousand years or so. Areas of the world that are tropical now were once (even several times) under kilometers (deep that is) of ice. Most of Europe and North America were under huge sheets of ice. As those ice sheets advanced and retreated over thousands of years, they tended to dig (or plow) valleys. That's how you get valleys created from glaciers that are no longer around.

Answer 2

http://ga.water.usgs.gov/edu/earthglacie...

The last iceage had glacial ice into the middle US, not much further south than northern North Carolina..........The tropic/subtropic areas were cooler, but not ice covered.

Answer 3

They start atop high mountains, where temperature is cold enough even in tropical area.

Answer 4

Altitude.  Temperatures drop as height increases.  Mt Kilimanjaro is very close to the equator.  It is also almost 4 miles high (19,341 feet).