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#24=Cross Sectional Scale Model Earth Test - 24 min. time limit (2min/item): Using ONLY your OWN
Scale Model Earth Cross Sectional Map, answer the following in explanatory &/or illustrated
sentences: (24 test points {12 items x 2pts. ea.})
1) What is the power supply for plate motion?
Uranium in the Solid Inner Core (~ 5,500 C )
2) Why is the hotter inner core solid and the cooler outer core liquid?
Pressure (360 GPa, 52x10^6 psi)
3) What is the source of Earth's magnetic field?
Solid Inner Core Rotation & Liquid Outer Core Convection
4) How is Earth's mag-field used by surface life?
Radiation Shield
5) How do elements in the outer core & lower mantle get transported to & combined into molecules in
the upper mantle? Convection (high temp.+ high density @ lower boundary = lowers density,
rising to upper boundary, cools, falls, and repeats)
6) What is the most massive layer of Earth, and what is it's most massive component?
Mantle - Oxygen
7) Where does the Earth's atmosphere come from, and how is transported to where we find it?
Lithosphere - Volcanoes
8) Where does the Earth's hydrosphere come from, and how does it get to where we find it?
Lithosphere - Volcanoes
9) What is the source of all the solid chemical elements found on Earth's surface, and how do they
get to where we find them?
Lithosphere - Volcanoes
10) Why is it foreseeable impracticable to drill into or through Earth's mantle, or core layers?
Heat + Temp melts anything solid on the surface.
11) Where do we find most mountain ranges, volcanoes, and earthquakes on Earth's surface?
Plate Boundaries
12) What structure is the seafloor basalt and continental granite of Earth's solid rocky crust embedded
in, and moved by? Lithosphere - Tectonic Plates