Sedimentary rocks are rocks formed from the compression of sediments, dirt, or sand we see on the surface of Earth today.

The red planet’s sedimentary rocks mostly formed when water helped glue together sediments that accumulated in ancient rivers, lakes, and sand dunes.

Environment How are sand dunes formed and why do they even exist? The strange, beautiful shapes that sand dunes form are a mystery.

“Monazite can form under really low-temperature conditions, when sand is becoming a sandstone, and with rutile (the most common form of titanium dioxide found in nature), you can figure out the ...