How do rocks form?

Maybe you’ve never thought twice about rocks, but there has to be a reason that they are covering the Earth’s surface right? We just had to know how they got here, so we asked rock expert Mary Leech to help us find the answer.

Got a question that really rocks? Send it to us at 

Maybe you’ve never thought twice about rocks, but there has to be a reason that they are covering the Earth’s surface right? We just had to know how they got here, so we asked rock expert Mary Leech to help us find the answer.
Got a question that really rocks? Send it to us at BrainsOn.org/contact, and we’ll help unEarth the answer. 

Joan Garcia CC BY-SA 3.0

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Smash Boom Best is a debate show for kids and families from the makers of the award-winning podcast, Brains On! Every episode takes two cool things, smashes them together and lets you decide which is best.


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A history show for the whole family! Every episode explores the origin of just one thing — like sandwiches, video games, clocks and more — while teaching listeners to think critically about history.


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Our mission is to encourage kids’ and curious adults’ natural curiosity and wonder using science and history…but there’s no age limit on curiosity, and episodes of Brains On can be enjoyed by anyone.


How do rocks form?

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