Which of these is metamorphic rock formed from limestone?
a. shale
b. clay
c. sandstone
d. marble

The correct answer is option D - Marble.

The marble is a metamorphic rock that forms when limestone is under the heat and pressure of metamorphism. It is composed mainly of the mineral Calcite and it generally contains other minerals such as quartz, graphite, micas, etc.

Besides, the characteristics swirls of the colored marbles varieties are usually the result of the mixture of various mineral impurities such as sand or iron oxides.

Marble is commonly used as a building material and for sculpture.

the median of the data is 4.

step-by-step explanation:

the median means the middle number of a given number.

to decide which one is the median, arrange in ascending or descending order. but sometimes, you may find two(2) number in the middle, but it's easy, just add them together and divide by 2.

so,   determine the median of the data. 2, 3, 3, 4, 5, 7, 9

it is already arranged, count 3 times forward and 3 backward and the one left is your answer.

2,3,3,4,5,7,9

our answer is 4.

hope this !

is there multiple choice or do you need like an essay answer?