____________ and ____________ are the two primary components of Earth’s current atmosphere.
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As _____________ and ______________ separated, the Gulf of M…
As _____________ and ______________ separated, the Gulf of Mexico began to form.
The has only been one supercontinent throughout Earth’s hist…
The has only been one supercontinent throughout Earth’s history.
Throughout Earth’s history, the composition of the atmospher…
Throughout Earth’s history, the composition of the atmosphere has changed.
Most continents contain large central areas in which very an…
Most continents contain large central areas in which very ancient rocks are exposed. These areas are called ____.
The mantle is primarily composed of __________.
The mantle is primarily composed of __________.
A tetrapod is a(n) ____.
A tetrapod is a(n) ____.
Almost all species of bony fish today are ray-finned fish.
Almost all species of bony fish today are ray-finned fish.
The single, worldwide ocean that surrounded Pangaea was call…
The single, worldwide ocean that surrounded Pangaea was called:
From oldest to youngest, what are the three time periods of…
From oldest to youngest, what are the three time periods of the Mesozoic?