…and how we know it today
How Did the Earth Form? KMR0nx8&feature=related KMR0nx8&feature=related Heat from collisions demo What is evidence of these collisions?
What is the evidence this happened? Composition of the earth Residual heat Layers (inner, outer, mantle, crust)
Earth began to cool… But not for long… Origin of the Moon Origin of the Moon
Evidence of Impact Earth spins as a result of the impact Composition of the moon is similar to earth’s crust: (density of moon) similar oxygen isotope ratios between the Moon and the Earth Tilt of the earth’s spin
Alternate Theories The moon formed near the Earth as a separate body The moon formed as part of the Earth and separated from it The moon formed somewhere else and was captured by the Earth
Earth Began to Cool After large impact and moon formation, earth began to cool
How do we know earth rotates? (before we could go to space…) Foucault Pendulum Foucault Pendulum Earth bulges at equator Sunrise/Sunset Movement activity
How do we know earth revolves? Parallax Parallax Diagram Parallax Diagram Parallax lab