sometimes the rail tracks become curved. Explain why does this happen? How can such situations be avoided?

The rail tracks become curved because:
- We know that the heating of any metal causes it to expand. In the same way the heat of the sun causes the metal tracks to expand.
- Sometimes there is very less space between the tracks and thus the railway tracks don't get space to expand and thus they get curved.
- These situations can be avoided by making the railway tracks at some space from each other so that they get the space to expand and not get curved.
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bhavuk prasad sarthak gave correct answer 
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