What is the difference between a rock and a boulder?

Answer 1

rock is natural while stone is artificial.the rock found under the earths surface while the stone found anywhere on our earth's surface.

Answer 2

Rock is a name given to a natural earth material composed of an aggregation of clasts or crystals of differing minerals.

The word boulder is used to describe a piece of rock of a certain size. In this case a boulder is a clast of rock with a minimum diameter of 200mm (UK and European standards) and 256mm (US). Boulder is the largest individual clast sized recognised and is therefore given to any individual clast larger than the minimum diameter specified here.

Source of particle size data:

Weltman, A.J. and Head, J.M. (1983). Site investigation manual. CIRIA Special Publication 25 / PSA Civil Engineering Technical Guide 35.

Answer 3

A rock is a general term for any natural substance made of minerals. A boulder is a specific type of rock that is larger than a person and is typically found as a single large fragment. The main difference is in size, with boulders being much larger than rocks in general.

Answer 4

Pebbles are smaller and usally more smoother.

A Pebble was once a part of a rock, which has broken away, and been shaped (smoothened) by the either the action of water or air or ice.

Answer 5

it is sedimentary