A _______ is an educated guess about the outcome of an experiment.

Scientists think the earth was formed_____________ years ago

4.6 billion

Things that are purposely kept the same throughout an experiment are called

Constant

Which layer of the Earth is Rocky and surrounded the Earth like a shell or skin

Crust

Name the three layers of the Earth according to the diagram below

Crust,mantle,outer core, inner core

A factor in an experiment that changes as a result of the independent variable is called the

Dependent variable

The preserved remains or imprints of animals plants and other organisms from the distant past are called

Fossils

A_________ is an educated guess about the outcome of an experiment

Hypothesis

A variable in an that is purposely Changed by the experimenter is called an

Independent variable

When you explain or make sense of your observations you are making an

Inference

Which layer of the Earth is the thickest

Mantle

Something You observe with your own eyes is called an

Observation

Which layer of the earth is made melted iron and nickel

Outer core

The steps scientists use to figure out why things happen the way they do is called an

Scientific method