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Scientific Method - ✔✔1- Observe, investigate and gather data
2- Formulate one or more hypotheses to explain observations
3- Test hypotheses
4- Discard hypotheses that do not support tests
5- Tests should support one hypothesis
6- Hypothesis may become theory if supported my many tests
Principle of Uniformitarianism by who - ✔✔The present is the key to the
past by Sir James Hutton.
Scientific estimate of the age of Earth - ✔✔4.56 billion years old, but the
oldest fossil only dates to 570 million years old
Scales (time) of geological events - ✔✔Rapid- volcanic eruptions,
earthquakes
Intermediate-ice ages
Slow- mountain building
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©JOSHCLAY 2024/2025. YEAR PUBLISHED 2024.
, Earth systems interactions - ✔✔atmosphere, hydrosphere, biosphere,
geosphere
Earth's energy sources - ✔✔External- from the sun- solar radiation
Internal- from the Earth's interior- geothermal radiation
3 ways energy is transferred - ✔✔1: Radiation- via passage of
electromagnetic waves
2: Conduction- via direct contact
3: Convection: density differences (heat rises, cold sinks)
Earth's radius and circumference plus who discovered it - ✔✔Radius-6,371
km or 4,000 mi. Circumference- 40,000 km or 25,000 mi. Eratosthenes
Density - ✔✔Mass/volume (g/cm3)
Shape and size of Earth - ✔✔Spherical squished pumpkin
Sir Isaac Newton's equation for the force of gravity - ✔✔F=G(m1xm2/r^2)
What did Henri Cavendish do - ✔✔discovered the weight of the world using
Isaac Newton's gravity equation
Average density of Earth vs. density of rocks at the surface - ✔✔average
density of Earth is 5.5 g/cm3 vs 1-3 g/cm3
What makes up Earth's interior - ✔✔crust mantle and core, asthenosphere
and lithosphere
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©JOSHCLAY 2024/2025. YEAR PUBLISHED 2024.