The sandhill will soon be knocked down by a gust of wind or could've been made from wind carrying sand over for years.
The water rubs agaisnt the sand, causing indents. The island will eventually be gone from the water eroding it so much.
after an earthquake, there is usually a landslide which is when mud from the top of a hill or any other substance falls from the top. It usually lands on a man-made object when near the object.
earthquakes cause objects to break and split. Most man-made objects aren't built to stand the rapid movement of the earth called earthquakes.
Volcanos cause objects to burn and be covered in ash which colors it a charcoal black. Most man-made objects aren't made to withstand volcanos fiery spit.
the continental drift was caused by the plate tectonics. The continents used to be connected, the continents look like they almost perfectly fit together and would've perfectly fit together if it wasn't for erosion eroding the continent's sides causing them to change a little year by year. Animals fossils from one place may be found in another place because those places used to be together.