How long does it take a natural arch is formed?

Answer 1

Actually an arch is formed using these steps:

Step1:Waves crash against the cliff and erode joints in the cliff face this creates a small hole in the Cliff or a notch

Step 2: Waves erode the notch making it bigger it is now a cave

Step 3: The cave gets bigger and eventually punches a whole in the cliff forming an arch.

Now that an arch has been made this is what will happen to the arch in the future!

Step 4: the arch will eventually collapse due to further erosion and gravity the arch will collapse this leaves a pillar of rock disconnected from the land this is called a stack

Step 5: The bottom of the stack is eroded between the high and low tide marks, unsupported chunks of rock will now collapse leaving a spindly structure called a Pinnacle.

Step 6: eventually due to MORE erosion the pinnacle collapses leaving a stump

Answer 2

it takes about 50,000 years