(noun) The geologic time period starting about 3.8 billion years ago and ending about 2.5 billion years ago, during which Pangaea formed.

• Cenozoic Era

• Achaean Eon

• Hadean Eon

• Paleozoic Era

Tags

NGSS.MS-ESS1-4

(noun) The most recent era of geologic time, from about 65 million years ago to the present. Characterized by the formation of modern continents and the diversification of mammals and plants. The limate was warm and tropical toward the beginning of the era and cooled significantly in the second half, leading to several ice ages. Humans first appeared near the end of this era.

• Cenozoic Era

• Mesozoic Era

• Proterozoic Eon

• Paleozoic Era

Tags

NGSS.MS-ESS2-2

NGSS.MS-LS4-2

(noun) A long period of time in history that has some consistent features.

• Geologic Time

• Time

• Period

• Era

Tags

NGSS.MS-ESS1-4

(noun) A bone, shell, or other trace of an animal or plant from millions of years ago, preserved as rock.

• Rock

• Humus

• Fossil

• Dinosaur

Tags

NGSS.MS-LS4-1

NGSS.MS-LS4-2

(noun) The period of time covering the formation and development of the Earth, from about 4.6 billion years ago to today.

• Geologic Time

• Clock

• Era

• Eon

Tags

NGSS.MS-ESS1-4

(noun) The geologic time period starting about 4.5 billion years ago and ending about 4 billion years ago, during which the Earth's crust hardened and the moon formed.

• Mesozoic Era

• Paleozoic Era

• Cenozoic Era

• Hadean Eon

Tags

NGSS.MS-ESS1-4

(noun) The geologic time period starting about 251 million years ago and ending about 66 million years ago. Dinosaurs first appeared toward the beginning of this era, and became extinct at its end. Flowering plants also developed at this time.

• Proterozoic Eon

• Achaean Eon

• Mesozoic Era

• Hadean Era

Tags

NGSS.MS-ESS1-4

(noun) The geologic time period starting about 542 million years ago and ending about 251 million years ago, during which sea-dwelling invertebrates, fish, reptiles, and land plants first appeared.

• Achaean Eon

• Paleozoic Era

• Cenozoic Era

• Mesozoic Era

Tags

NGSS.MS-ESS1-4

(noun) A very large continent that is thought to have existed around 250 million years ago. Scientists believe that all of the land on Earth was joined together in a single continent which, according to the theory of plate tectonics, later broke up into the continents we know today.

• Land Mass

• Geologic Time

• Pangaea

• Fossil

(noun) A theory in geology that states that the Earth's lithosphere (its crust and upper mantle) is divided into a number of large, plate-like sections that move very slowly over the inner part of the Earth. This theory explains how the continents slowly change their positions over thousands of years, and shows that mountains, volcanoes, and underwater trenches occur where the plates crash together or pull apart.

• Lithosphere

• Pangaea

• Geologic Time

• Plate Tectonics

Tags

NGSS.MS-ESS2-3