Fact 1: If fossils of a water animal or plant are found in a place then that place used to be covered by water in the past.

Fact 2: Marine fossils found in the interior of the continent.

Given the two facts above, answer the question "Why are marine fossils in the interior of a continent?" with the following options: 
- erosion from rivers
 - It used to be covered by water
 - They evolved to be land animal
 - basic building blocks of life
 - They washed ashore
 - the wearing away of rock
 - Land animals ate them
 - units of heredity


 

  It used to be covered by water       