Sedimentary rock is the correct answer
Where are the multiplied choices?
Unsure. Although it has been proven that microorganisms can live out in space, no one has seen an organism native to planets besides Earth.
Natural elements typically erode ancient ( and all ) buildings and structures overtime. That and an increasing amount of tourist attraction also doesn’t help the decaying... well everything. An article from the guardian supports this and even says that last year the EU threatened to remove the funding of the Great Pompeii Project which conserves and restores this ancient site.
They allow you to see how the continents were once placed together.
