chemicals to react. volcanoes to erupt. lightning to strike Earth. the planets to orbit the Sun.
I am hesitating between 4 options to answer the following question, which option should I choose?
Question: When Isaac Newton theorized that gravity caused objects to fall to the ground, he had also discovered the force that causes
Possibilities:
- chemicals to react.
- volcanoes to erupt.
- lightning to strike Earth.
- the planets to orbit the Sun.

the planets to orbit the Sun.