Grade 7 Science Unit 4: The Earth’s Crust

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Presentation transcript:

Grade 7 Science Unit 4: The Earth’s Crust Geological Time Scale

Fossils The remains of organisms that lived long ago. Some of the oldest rocks and fossils are found in our province.

Fossils can be... 1. Preserved as film on rocks.

2. Petrified (turned to stone.

3. Actual remains preserved in ice.

4. Traces such a footprints in mud that harden into rock.

Geological Time Scale Divides Earth’s history into smaller units (eras) based on the appearance of different kinds of life forms in the fossil record.

The Four Main Eras... 1. Precambrian Era 4600 million years ago Formation of the Earth and the appearance of simple life forms. Ex. bacteria

2. Palaeozoic Era 590 million years ago Appearance of more complex life forms. Ex. plants, amphibians and reptiles

3. Mesozoic Era 248 million years ago Appearance and extinction of dinosaurs. First mammals, birds and flowering plants.

4. Cenozioc Era 65 million years ago to the present. Appearance of Humans