Ice age.

 Ice age is a period in history of Earth. In that time climate changed on our planet. The temperature became lower in different places.

There were many ice ages: the Huronian (2.4-2.1 billion years ago), Cryogenian (850-635 million years ago), Andean-Saharan (460-430 million years ago), Karoo (360-260 million years ago), and Quaternary (2.6 million years ago-present).

During these periods landscapes and Earth's surface changed. Ice aged influenced many different things on our planet.

At the end of these events some animals became extinct, such as: saber-toothed cats, the mastodons, giant ground sloth, wooly mammoth, and other.

Homo sapiens appeared. Humans created new tools for survival in a cold climate. Also, ancient people developed agriculture.

Geology is a science of study ice age. Scientists named geologists study these important periods. They found plants and animals in large glaciers.

Source of image:

https://www.shutterstock.com/es/image-vector/collection-ice-age-animals-mountains-280531367

Source of image:

https://www.shutterstock.com/es/image-illustration/illustration-herd-woolly-mammoths-grazing-early-347240843

Source of image:

https://www.shutterstock.com/es/image-illustration/sabertoothed-cat-tries-drive-shortfaced-bear-1157175928