Layer 1 was deposited was the third layer to be deposited because it is at the top.
Intrusion 2 formed is formed sixth because it's an intrusion but it hasn't reached the top layer yet.
Intrusion 3 formed is formed fourth because it's an intrusion which means its younger then the layers.
Layer 4 was deposited is the first to be deposited because it is the lowest which means it was there first.
Layer 5 was deposited is the second one to be deposited because it is the second lowest.
Earth cracked at fault B was formed last because of the Principle of Initial Horizontality.
Your order has a few errors in it. It looks like intrusion 2 was eroded flat before the layers above it were deposited, so it is probably older. Also, take a look at which layers "B" breaks and which ones it doesn't. If the whole earth moved when "B" happened, all the layers that were present would have been broken. How would these changes affect the overall order?
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