Something called ice wedging caused the rock to crack.
Can you show me?
Ice wedging happens when water freezes in a crack in rock. then when the temperature drops below freezing, the water expands and freezes which expands the crack.
Ok, what's next?
First, water seeps into a crack of a rock or piece of Earth from rain or stream channels. Then the water freezes from temperature fluctuation (from day to night) which expands the rock making the crack larger.
so what happens if this process keeps repeating itself?
Then the water melts again fron temperature fluctuation (night to day) eventually evaporating the water and you are left with a larger crack.
Well in the future the rock would be in many differen sized pieces.
here, something I found on the internet to prove what I told you.