How do river rocks form? - Quora

Answer (1 of 2): River rocks are nothing more than rocks that got into a stream of flowing water. Nothing else matters for that classification. Regardless of how angular or irregular they are when they enter the water they will become rounded with time due to two processes. The first process is t

Where do rocks come from? Why are there some many all through your yard in various sizes when you dig? - Quora

What is lava rock? - Quora

How do igneous rocks form? - Quora

How are rounded rocks and boulders formed? - Quora

What elements are pebbles composed of? - Quora

What is an example of an igneous rock that is called an aphanitic rock? - Quora

Why do metamorphic rocks have colours? - Quora

How do porous rocks form? - Quora

How are rocks formed on Earth? - Quora