Landslides are dependant upon plate movements of the earth.They don't have fixed intervals in which they can occur,that is seismologists are always monitoring plate movements in order to help them predict earthquarke activities
Many Years. Many Years.
1 million years
1 million+ Years to be a diamonds... :/
1.
One Billion!
it takes a delta to form 100 years or more
Tsunamis can be formed after certain underwater events take place. A tsunami can form after an underwater landslide, earthquake or volcanic eruption.
There are many types of fossilization. Some take a surprisingly few number of years, and others occur over periods of millions of years.
It could take minutes or thousands of years, depending on the rate of cooling.
The average growth rate is 0.13 mm a year
Probably a few million years. Most likely many years, due to Evolution. :P
precautions during torrential rain