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It seems it has to do with how much water the watermelon has soaked in a given time interval:
http://who-what-where-when-how-why.blogspot.com/2011/09/why-do-watermelons-crack-split-open.html
And some types of watermelons are thin-skinned and have a higher propension to split easily.
The article link above states that it might also have to do with pesticides and fertilizers, but I doubt it applies to watermelons here in North America.
What else can I help you with?
How are watermelons processed?
WATERMELONS ORIGONATE FROM THE AFRICAN DESERTS
Why are watermelons organic?
watermelons arent always organic
What is the mass of 10 watermelons?
the mass of 10 watermelons is 90kg
What are the nouns in this sentence... their brains may be as big as watermelons?
brains, watermelons
What Oregon city is famous for watermelons?
The city of Hermiston, Oregon is famous for their watermelons.
Do watermelons have vitamins?
yes, watermelons do have vitamins. they have vitamin A and C for eysight and the brain.
What is the watermelons common names?
watermelons command name is a fruit or a green fruit
What county grows the most watermelons?
The country that plants the most watermelons is China
Why does R Lee Ermey hate watermelons?
He really doesn't hate watermelons. It is a joke for his show, Mail Call. He often uses watermelons as targets for weapons demonstrations.
Who wants watermelons?
I do!
How togrow watermelons in your back yard?
Yes, you should be able to grow watermelons in your home garden
Do watermelons have flowers during their growth cycle?
Yes, watermelons do have flowers during their growth cycle.
