1.What is the highest mountain on the earth and how high is it?

1.What is the highest mountain on the earth and how high is it?
1.What is the highest mountain on the earth and how high is it?
2.What is the deepest point in the ocean and where is it?
3.Which is the longest river on earth and how long is it?
4.What is the distance from the earth to the moon?What is it to Mars?What is it to the nearest star?
5.How far is it to the centre of the earth?
6.How high are the temperatures near the centre of the earth?
7.What is the longgest distance around the world?
8.How fast does a balloon travel?How about an aeroplane?How about a space shuttle?