Higher and colder

1. READ/play the text
2. CLICK the picture (and video)
3. TRY this:

Q1: How much colder does it get if you go a thousand metres up a mountain?

[Answer]

The higher up a mountain you go, the colder it gets compared to the valley below.

In fact, it gets, on average, 5 degrees Celsius colder for each 1000m you gain in height.

This is why it is almost always below freezing on the tops of the world's tallest mountains - and why they are snowcapped.