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The principle of uniformitarianism states that “the present is the key to the past.”  Briefly explain how geoscientists apply this principle to explain past processes.

From top to bottom of Bowen’s Reaction Series, the minerals get

Earth’s continents are generally thought to be

From top to bottom of Bowen’s Reaction Series, the melting point

If the Yellowstone hotspot was in the middle of the Pacific Ocean, do you think it would be a more explosive volcano, or less explosive?  Why?

From top to bottom of Bowen’s Reaction Series, silica content

Fill in the table, in proper order, with all periods of the non-Precambrian Geologic Time Scale.  Please remember the law of superposition! Era Period  Cenozoic Period A ” Period B ” Period C  Mesozoic Period D ” Period E ” Period F  Paleozoic Period G ” Period H ” Period I ” Period J ” Period K ” Period L ” Period M Period A is Period B is Period C is Period D is Period E is Period F is Period G is Period H is Period I is Period J is Period K is Period L is Period M is  

Intrusive rocks are igneous rocks which are ___________below earth’s surface.

Human recorded history comprises __________of the earth’s history.

Explain why shield volcanoes do not have the stereotypical conical shape of other volcanoes.  Be sure to include information about the lava’s composition and viscosity.