2006-10-04 03:05:06 · 18 answers · asked by Andrea P 2 in Science & Mathematics ➔ Earth Sciences & Geology
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!
2006-10-04 05:18:14 · answer #1 · answered by Paul FB 3 · 2⤊ 0⤋
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.
2006-10-04 03:41:38 · answer #2 · answered by boyfriend_love_jessica 2 · 2⤊ 0⤋
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)
2006-10-04 07:06:19 · answer #3 · answered by steppers4 1 · 0⤊ 1⤋
Boulders are large rocks that have become smooth/rounded by erosion - either by glaciers, in river beds or by coastal erosion.
2006-10-04 04:40:40 · answer #4 · answered by Anonymous · 1⤊ 0⤋
i always thought they were the same thing, except a rock is like a boulders baby sister.
2006-10-04 03:17:06 · answer #5 · answered by clutterbug84 3 · 0⤊ 1⤋
I think of a rock as a jaggy thing and a boulder more round !
2006-10-04 03:10:20 · answer #6 · answered by Gem 3 · 0⤊ 1⤋
usually a boulder is alarge piece of rock that through natural erosion breaks off,
2006-10-05 07:39:15 · answer #7 · answered by herbal ashtray 4 · 0⤊ 0⤋
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.
2006-10-04 03:18:04 · answer #8 · answered by genghis41f 6 · 1⤊ 0⤋
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.
2006-10-04 03:07:39 · answer #9 · answered by eaglemyrick 4 · 1⤊ 2⤋
it doesnt. Larger stone break down into big boulders.. then into smaller rocks
you dont grow them, they break down
2006-10-04 03:41:05 · answer #10 · answered by miz Destiny 3 · 1⤊ 0⤋