Give the number of significant figures indicated.

0.066

a. 3
b. 0
c. 1
d. 2

The correct answer is option D.

Explanation:

Significant figures:The figures in a number which indicates the value or magnitude of a quantity to a specific degree of accuracy.

Whenever there are zero’s preceding the first integers  we never count them as significant. For example: 0.0078 has two significant figures.

In given number the number of significant figures is 2 That is '6' and '6'.

answer is: naturally occurring solid, inorganic compound or element is mineral.

minerals usually have crystalline form, that means than crystal constituents (atoms, molecules or ions) are arranged in a highly ordered microscopic structure, forming a crystal lattice that extends in all directions.

for example magnetite is a mineral of iron oxide (fe₂o₃).

calcite is a carbonate mineral and the most stable polymorph of calcium carbonate (caco₃).

dolomite is an   carbonate mineral composed of calcium magnesium carbonate (camg(co₃)₂).