4. Consider the following statements about the Big Bang Theory.
1. It established the fact that the Earth's crust moved to fit itself into its orbit.
2. The Universe is a result of the explosion that happened approximately 18000 million years ago.
3. The matter that was thrown out of this explosion condensed into lumps called 'Galaxies'.
4. The continents gradually drifted to where they are now located.
Select the correct answer by using the codes given below.