East Antarctica is covered by massive layers of ice. The ice is thousands of meters thick.
Which revision combines the sentence using a subordinating clause and subordinating conjunction?
East Antarctica is covered by massive layers of ice, which is thousands of meters thick.
East Antarctica covered by massive layers of ice, which is thousands of meters thick.
East Antarctica, covered by massive layers of ice, is thousands of meters thick.
East Antarctica is covered by massive layers of ice thousands of meters thick.

Respuesta :

The correct answer is: East Antarctica is covered by massive layers of ice, which is thousands of meters thick.

This is because it is the only sentence that is grammatically correct while fitting the description that you had in your question.