Question

MEDAAL!
*MULTIPLE CHOICE (UCAN CHOOSE MORE THAN 1 ANSWER!)

What is meant by the reference to the earth being an "isolated" planet?

All of the elements of the earth are retained.
The earth is losing mass (elements).
The only thing entering and leaving the earth is energy.
The earth is gaining mass (elements).

Answer 1

@goformit100 @ash2326 @andriod09 @Nurali @ganeshie8

Answer 2

"All of the elements of the earth are retained." No, some decay into other elements.
"The earth is losing mass (elements)" mass=/= elements. The earth is not losing mass, but elements, yes (see question above).
"The only thing entering and leaving the earth is energy" nope, meteorites introduce mass into earth (although very minimal).
"The earth is gaining mass (elements)" See above question.

Answer 3

I know this question is closed but for future reference: The answers are A and C