Compared with today, the temperature on Earth during its first half-billion years was probably
A) considerably warmer.
B) considerably colder.
C) about the same as today.
D) about the same as today on average, but the diurnal fluctuations were much greater.

Question

Quizplus · Accepted Answer

During the first half-billion years, Earth experienced intense volcanic activity, which resulted in a greenhouse effect that kept the planet considerably warmer than it is today. This warmth allowed for the formation of oceans, which in turn provided a stable environment for the evolution of early life forms.

Compared with Today, the Temperature on Earth During Its First