how are marble and chalk chemically similar? how can you test this common feature?
Answers
Explanation:
Chalk is a soft, white, porous, sedimentarycarbonate rock, a form of limestonecomposed of the mineral calcite. Calcite is an ionic salt called calcium carbonate or CaCO3. It forms under reasonably deep marine conditions from the gradual accumulation of minute calcite shells (coccoliths) shed from micro-organisms called coccolithophores. Flint (a type of chert) is very common as bands parallel to the bedding or as nodulesembedded in chalk. It is probably derived from sponge spicules or other siliceous organisms as water is expelled upwards during compaction. Flint is often deposited around larger fossils such as Echinoidea which may be silicified (i.e. replaced molecule by molecule by flint).
ChalkSedimentary rock.
Explanation:
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