Bellringer

Did you see that, QUIETLY?!

QUIETLY get INB Page 11 set up for C-Notes

Precambrian Era544 million years ago-4.6 billion years ago

It all started with a big bang!

This era included 3 major periods:Hadean period (when the moon and earth were formed)Proterozoic period Archean period

The Precambrian period covers 88% of Earth’s history!

Early Earth

The Precambrian Time began with the formation of earth!Roughly 4.6 billion years ago.Scientists believe the earth began as a ball of dust, rock, and ice in space. Gravity pulled the masses together and these materials stuck together. Kinetic energy changing into thermal energy caused the hot core temperatures.

Precambrian EarthFeature Early Earth Later Precambrian

EarthAtmosphere Hydrogen and helium.

Eventually exploded and these particles blew away Earth’s first atmosphere.

Carbon dioxide, water vapor, and nitrogen. Collisions with comets added other gases.

Oceans Too hot for water to remain as liquid, so there were no oceans.

As Earth cooled, water vapor condensed as rain and accumulated as oceans. These oceans absorbed carbon dioxide from the atmosphere.

Continents Continents moved slowly over Earth’s surface because of forces inside earth. This was called continental drift.

As time has gone on, continental drift continued to slowly move. Only a few cm a year.

Comet-Ball of dust and ice that orbits the sun.

Continental drift-continents slowly move over Earth’s surface.

Continents during Precambrian Age

5 Things to know about Precambrian

1-Formation of Sun and light.2-Creation of the Earth3-Creation of the atmosphere through volcanic out-gassing4-Creation of the Oceans5-Creation of life

Precambrian Life Forms

Fossils found in rocks of Single-celled organisms from 3.5 billion years ago.These life forms were similar to present-day bacteria.2.5 billion years ago, organisms began using photosynthesis to get their energy from the sun.

Protozoa

Single celled eukaryotic animals Found in soil, freshwater, and oceans Smallest of all animals; mainly parasites

amoeba, euglena and paramecium.

Annelids

Worms with cylindrical bodiesLeeches and earthworms

Other Precambrian LifeformsSea pensCnidariansYeastSpongesCoralsSea cucumbersSea urchinsHydraMossStromatolitesGirvanellaBlue-green algae

TOTDTell me 10 things you learned about Precambrian time period today…without your notes!