Name the following :
Various sources of carbon.

Name the following: An amorphous allotrope of carbon which floats on water.

Name the following: An allotrope of carbon used for the manufacture of coke.

Name various sources of air pollution.

Name the following. Two sources for producing potential difference

Name the two groups in which various sources of energy are calssified. State on what basis are they classified.

Name the following : The source of CO_(2) for aquatic plants

Name the following: A crystalline allotrope of carbon built up from a hexagonal unit.

Define allotropy. Name the various allotropes of carbon.

Name two sources of sound.

Name various bones of cranium.