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The structure of plant, animal, and bacterial viruses are each, fundamentally, very different from one another.
K-Pg Boundary
A geological signature marking the transition between the Cretaceous (K) and Paleogene (Pg) periods, approximately 66 million years ago, associated with the mass extinction event that included the demise of the dinosaurs.
Cretaceous Period
A geological period from about 145 to 66 million years ago, known for being the last portion of the age of dinosaurs.
Tectonic Plates
Massive, irregularly shaped slabs of solid rock composing the Earth's lithosphere, whose movements cause earthquakes, volcanic eruptions, and the formation of mountains.
Molten Rock
Liquid rock usually found beneath the Earth's surface, also known as magma when underground and lava when it emerges on the surface.
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