What is the word or phrase?

Find a 9-digit number, which you will gradually round off starting with units, then tenth, hundred etc., until you get to the last numeral, which you do not round off. The rounding alternates (up, down, up ...). After rounding off 8 times, the final number is 500000000. The original number is commensurable by 6 and 7, all the numbers from 1 to 9 are used, and after rounding four times the sum of the not rounded numerals equals 24.

Count the Triangle in the figure given below:

My thunder comes before the lightning; my lightning comes before clouds; my rain dries all the land it touches. What am I?

What jumps when it walks and sits when it stands?

What does this simple rebus mean?

Can you start the fire using two pieces of wood?

There's one "sport" in which neither the spectators nor the participants know the score or the leader until the contest ends.

What is it?

I am beautiful, up in the sky. I am magical, yet I cannot fly. To people I bring luck, and to some people, riches. The boy at my end does whatever he wishes. What am I?

Forwards I am heavy, backward I am not. What am I?