Answer:
1.rock gets destroyed
2.rock get stuck under sailers shoe
3.sailer walks on land
4. sees rock under shoe
5. he takes of rock from shoe and throws it away
6. millions of years later you step on that same grabit
Explanation:
I think 1991 it was the fall of soviet union
Contour lines do not cross one another because each line represents a different elevation on a topographic map.<span> </span>