History of the Earth

1. Order these vocabulary words from smallest to largest : universe, solar system, planet, galaxy

2. How are the geocentric and heliocentric models similar? How are they different?

3. Explain why this is incorrect: “If the Earth’s orbit got smaller, the length of the Earth’s year would increase.”Write in complete sentences!

Don’t talk during the Catalyst!

Objectives

By the end of today, all SWBAT…

Describe the Big Bang Theory

Describe 7 important events in the history of the earth

12 billion years: Big Bang Theory

The Big Bang was an explosion of matter that created the universe

http://www.aisee.com/anim/bigbang.htm

Evidence of Big Bang Theory The redshift

When something that emits light moves farther away, the light looks more red

Light from faraway galaxies looks red…

Which means the universe is still expanding today!

Redshift!

http://www.lon-capa.org/~mmp/applist/doppler/d.htm

Formation of earth

1. Cloud of dust formed called nebula

2. Nebula forms disc with a ball surrounded by rings

3. Central ball forms sun and the rings form the planets of the solar system

4 billion years: Earth’s atmosphere

The Earth’s atmosphere was formed by volcanoes that released gas as they erupted

Gases: Nitrogen (N2) Water (H2O) CO2

SO2

NO oxygen here

NO oxygen here

3 billion years ago: Continents formed

The lithosphere cracked into pieces (plates) as the Earth cooled. The plates collided to create continents

Lithosphere = outer solid part of the Earth (crust and upper mantle)

2.5 billion years: Oceans formedWater collected as oceans when Earth cooled

2 billion years ago: First plants

Plants added oxygen to the atmosphere (through photosynthesis)

340 million years ago: First ReptilesReptiles were the first animals to live on land

250 million years: Pangaea formed

All continents formed one SUPERcontinent

Evolution of the modern-day earthhttp://www.wwnorton.com/college/geo/egeo/flash/2_1.swf

500,000 years: First Homo sapiens

Homo sapiens: modern-day humans

If Earth’s history were a pie graph…

Activity: Cat in the Hat

With a partner, quiz each other by pulling questions out of the “hat”

Earth’s History Timeline

As a class we will put together a timeline of the history of earth.

Each group will be responsible for creating a poster of ONE EVENT in this history

Each poster must have: Title 3 facts about the event Picture Include WHEN the event occurred

Exit questions

1. What happened in the Big Bang?2. Place these events in the correct

order (from oldest to most recent) First animals Atmosphere formed Continents formed First plants

Write in complete sentences!

Don’t talk during the Exit Question!