Supercontinents

The Americas, sometimes collectively called America, are a landmass comprising the totality of North America and South America. When viewed as a single continent, the Americas are the second largest continent by area after Asia and the third largest continent by population. The Americas make up most of the land in Earth's Western Hemisphere and constitute the New World.

Eurasia ( , ) is the largest continental area on Earth, comprising all of Europe and Asia. According to some models of the world, physio-graphically, Eurasia is a single continent. The concept of Europe and Asia as distinct continents dates back to antiquity, and is largely cultural, but their borders have historically been subject to change. For example, the ancient Greeks originally included Africa in Asia but classified Europe as separate land. Eurasia is connected to Africa at the Suez Canal, and the two are sometimes combined to describe the largest contiguous landmass on Earth, Afro-Eura

Afro-Eurasia (also known as Afroeurasia and Eurafrasia) is a supercontinent comprising the continents of Africa, Asia, and Europe. The terms are compound words of the names of its constituent parts. Afro-Eurasia has also been called the "Old World", in contrast to the "New World" referring to the Americas.

thumb|upright=1.35|The supercontinent of Pangaea with the positions of the continents at the [[Permian-Triassic boundary, about 250 Ma. AR=Amuria; NC=North China; SC=South China; PA=Panthalassic Ocean; PT=Paleotethys Ocean; NT=Neotethys Ocean. Orogens shown in red. Subduction zones shown in black. Spreading centers shown in green.]] thumb|Although not a supercontinent, the current Afro-Eurasian landmass contains about 57% of Earth's land area.

quasi-periodic aggregation and dispersal of Earth's continental crust

A paleocontinent or palaeocontinent is a distinct area of continental crust that existed as a major landmass in the geological past. There have been many different landmasses throughout Earth's time. They range in sizes since some are just a collection of small microcontinents, and others are large conglomerates of crust. As time progresses, and sea levels rise and fall more crust can be exposed, which makes way for larger landmasses. The continents of the past shaped the evolution of organisms on Earth and contributed to the climate of the globe as well. As landmasses break apart, species are