A / An ________________ is an explanation of a phenomenon that has been tested rigorously, and that holds true after competing hypotheses have been eliminated.

The two most abundant elements that can be found on Earth’s crust are ___ and ____.

Which statement is WRONG regarding the Earth?

The molten ________________ core gives rise to an extensive magnetic field.

135 million years ago, Pangaea broke up and formed __ (north part) and __ (south part).

Typical feature of __________________ margins is deep sea trenches.

The first line of evidence used to promote continental drift theory was that ____________.

What type of plate boundary does a mid-ocean spreading ridge represent?

“Present is the key to the past.” This statement refers to __________________________.

The law of superposition states that __________________________________________.

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