When does a rock become a boulder.?
Answers:
For engineering purposes in Britain and EU, the following particle size names apply:
less than 0.060mm, i.e. 600 micrometres: Silt and clay
600 micrometres to 2mm: Sand
2mm to 60mm: Gravel
60mm to 200mm: Cobbles
Over 200mm: Boulders.
There is no particle size called a "rock". A rock in enginering terms is any natural material with a compressive strength over 600 kilopascals (you can just about break a lump with your hands). In geological terms it is an "aggregation of minerals" so clay is a rock to geologist!
first the grain of sand grows into a pebble and in it's adolescent years it is known as a rock. as the rock ages, it grows bigger and bigger and this is when it becomes a boulder.
I think of a rock as a jaggy thing and a boulder more round !
when you stub your toe on it
When it demonstrates maturity and responsibility sufficient to EARN it.
When it's too heavy to lift!
After it grows up.
When its volume is greater than 1 cubic metre
i always thought they were the same thing, except a rock is like a boulders baby sister.
It has to show fine litho-leadership and pass geology exams to get promoted to the dizzy heights rank of "Boulder". Only the stoniest of hearts make it. they are highly revered by pebbles and stones alike, and they really do gather no moss.
it doesnt. Larger stone break down into big boulders.. then into smaller rocks
you dont grow them, they break down
A rock doesn't become a boulder. Boulders become rocks through erosion. Now, if the rock is melted by a volcano, it can combine with other melted rocks to become a boulder. Hope that answers your question.
when it's in colorado
Maybe we should ask those guys who are still argueing whether Pluto is a planet or not...
Boulders are large rocks that have become smooth/rounded by erosion - either by glaciers, in river beds or by coastal erosion.
A Rock and a boulder are the same thing, One is just bigger than the other, Rocks usually are broken of a much bigger sample(boulder)
usually a boulder is alarge piece of rock that through natural erosion breaks off,
When it's about to hit you on the head.
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