Riddle No. 1
I tremble involuntarily
whenever something breaks.
Scientists hope with some time
they'll learn from their mistakes.
Faults are to blame for my power
I helped to form the Earth
Not realizing this simple fact
people underestimate my worth.
I can be quite dangerous;
I'm the start of many ends;
when I'm 12 or higher,
your foundation bends.
Riddle No. 2
Some have flown over land and sea,
To plot where things are to create me,
Filled with squares either green or blue,
If you need to know where to go, I'm true
Through me you can see every hill and fen,
So tell me, what am I, then?
Riddle No. 3
It's always 1 to 6,
it's always 15 to 20,
it's always 5,
but it's never 21,
unless it's flying.
What is this?