Question

1. during which time period was earth a ball of hot liquid? proterozoic era cenozoic era mesozoic era hadean eon

Explanation:

The Hadean Eon is the earliest part of Earth's history. During this time, Earth was a ball of hot liquid due to intense heat from planetary accretion, radioactive decay, and volcanic activity. The Proterozoic Era followed the Hadean and had a more stable Earth. The Mesozoic Era is known for dinosaurs, and the Cenozoic Era is the current era with modern - day life forms.

Answer:

Hadean Eon