Bellwork 5/13 How old is Earth? When did life begin on our planet?

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Presentation transcript:

Bellwork 5/13 How old is Earth? When did life begin on our planet? What is Continental Drift? How many Ice Ages has Earth had? Is climate change natural?

Earth’s Geologic Past

Continental Drift

What kind of changes must have occurred? “Baby Earth” to Today What kind of changes must have occurred?

Paleoclimatology the study of past climates

How an Ice Age is Born

Two Main Factors Solar Radiation Composition of Atmosphere

How can solar radiation change? Eccentricity: change in Earth’s orbital path Tilt: change in Earth’s axial angle Precession: “wobble cycle”

How can atmospheric composition change? Biology Transition between Glacial & Interglacial periods Tectonic activity Geologic activity Emissions

How do we study this? Ice cores Corals Ocean sediment cores Leaf-margin analysis tree rings Radioactive Carbon dating Fossil pollen

Wait, so what’s the difference between “Climate Change” and “Global Warming”? “Global warming refers only to the Earth’s rising surface temperature, while climate change includes warming and the “side effects” of warming—like melting glaciers, heavier rainstorms, or more frequent drought.”—NOAA Typically “Global warming” refers to human-caused changes, while Climate Change includes natural phenomena

So, how has Earth’s Climate changed throughout billions of years? Let’s investigate.

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