EARTH

EARTHThe History

THERE ARE EVENTS IN EARTH’S HISTORY WHICH WE CONSIDER MILESTONES

Which do you think is one of Earth’s milestones?1st BirthdayBecoming a PlanetGoing Canoeing

• The planet began as a lifeless sphere covered in molten rock. It contained no water and was surrounded by hydrogen and methane gas.

4.6 BILLION YEARS AGO THE EARTH FORMED

What are hydrogen and methane?

SolidsLiquidsGasses

4.5 BILLION YEARS AGO

• The moon was formed• Scientist believe the

moon was once part of the Earth, but an asteroid hit earth and broke off a piece forming the moon.

What is the moon made of?

CheeseRockGas

• Bacteria arose on Earth

• Normally we think negatively of bacteria, but these bacteria help put oxygen into the atmosphere!

3.8 BILLION YEARS AGO

Which of these are caused bybacteria?

Tooth DecayOxygenBoth

• The earth began to cool and water vapor in the atmosphere began to cool and form the first clouds

3.6 BILLION YEARS AGO

What are clouds made of?

EarthBacteriaWater

• Eukaryotic cells evolved.

2 BILLION YEARS AGO

·These are single cells with a nucleus. You, plants and animals have these cells.

Which of these have eukaryotic cells?HumansPlantsBoth

• Earth has contained oxygen for only the last 10% of it’s history thanks to plants and cyanobacteria.

0.5 BILLION YEARS AGO THE EARTH’SATMOSPHERE BECAME SATURATED WITH OXYGEN

Which of theseNeed oxygen to survive?

TreesPeopleAll Living Things

LETS DIG DEEPER!!!

Use this handout link to learn more about the history of Earth!! When you are done reading answer the questions using this quiz link. Download to the computer and save in your assignment folder.

Feel free to open both documents side by side when looking for answers!

• CIG Center for Isot0pe Geochemistry, UC Berkley and LBNL. Web. 4 Oct 2010. <http://eps.berkeley.edu/cig/depaolo/eps102/PPT5_Condensation_Accretion.html>.

• "Elodea leaf." Mr. Fode- Life Science. Web. 4 Oct 2010. http://mrforde.blogspot.com/2008/10/when-you-look-at-this-image-you-can.html.>

• "Moon." THE BIG PHOTO. Web. 4 Oct 2010. <http://thebigfoto.com/earths-moon>. • Schrock , Kathy. "Birth of Earth." Discovery Education. Discovery Education, 2010.

Web. 6 Oct 2010. <http://school.discoveryeducation.com/lessonplans/programs/birthofearth/>.

• "Some Important Events in Earth’s History." Teaching Quantitative Skills in the Geosciences. National Science Foundation, 04/19/2010. Web. 5 Oct 2010. <http://serc.carleton.edu/quantskills/activities/calculatortape.html>.

• All clipart provided in this presentation was used from Microsoft Word by Microsoft Corporation.

REFERENCES:

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