Both coal and diamonds are forms of elemental carbon. Coal is brittle while diamonds are considered to be the hardest of all sub
stances known. What is the appropriate justification for this?
1 answer:
Diamond are created from coal after 1000's of years under pressure.
it cause a change in propertied but not elements
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Is ocean ridge
Explanation:
Plants showing hydrotropism grow in response to water.
Explanation:
p =w/t
160=3200/t
t=3200/160
t =20second