On the web, you can read about

Fossil formation takes ______________ to happen.

Stalactites and stalagmites were formed in

“Who” or “What” is doing the action is:

The simple predicate in this sentence “Minerals replace the bone matter.”

When an animal or a plant dies, it usually

A dead plant or animal is buried in a sediment that becomes

There are _______________ ways a plant or an animal would become a fossil.

The complete subject in this sentence “The active student George found an interesting article about fossils.”

_______________ are formed by the layers of sedimentary rocks.

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