User:Sndiego1501/sandbox

Original Sentence:

"The Yucatán Peninsula constitutes a significant proportion of the ancient Maya lowlands (although the Maya culture extended south of the Yucatán Peninsula, through present Guatemala and into Honduras and highland Chiapas), and was the center of the Mayan civilization."

Edited Sentence:

The Yucatán Peninsula constitutes a significant proportion of the ancient Maya lowlands and was the central location of the Mayan Civilization. The Mayan culture also extended south of the Yucatán Peninsula into country's Guatemala, Honduras, and into the highlands of Chiapas.

Insert Source:

According to the Alvarez hypothesis, the mass extinction of the dinosaurs at the transition from the Cretaceous to the Paleogene Period, the Cretaceous–Paleogene boundary (K–Pg boundary), 65 million years ago was caused by an asteroid impact somewhere in the greater Caribbean Basin.

The deeply buried Chicxulub crater is centered off the north coast of the peninsula near the town of Chicxulub. The now-famous "Ring of Cenotes," a geologic structure composed of sinkholes arranged in a semi-circle, outlines one of the shock-waves from this impact event in the ~66 million year old rock. The existence of the crater has been supported by evidence including the aforementioned "Ring of Cenotes", as well as the presence of impact debris such as shocked quartz and tektites, a type of glass formed during meteorite impacts.