Chapter 2 - Investigating Geologic Questions. The earth and its surroundings are full of mysteries. The object of science is to solve those mysteries and help human-kind. Can you name any earth mysteries? What causes . . . . Notes. Can you name any earth mysteries?. Earthquakes Volcanoes
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The earth and its surroundings are full of mysteries. The object of science is to solve those mysteries and help human-kind.
Can you name any earth mysteries?
What causes . . .
There is a layer of halite (table salt) beneath the floor of the Mediterranean Sea.
How come it hasn’t dissolved?
How did it get there?
Why doesn’t it dissolve?
It is protected by an overlying layer of silt and clay that doesn’t let the seawater contact the salt.
How did it form?
As seawater evaporates, salt is left behind.
A new question then presents itself.
Quantitative data: numeric measurements (conveyed with numbers)
Qualitative data: descriptions (conveyed with words or sketches)
Most recent (lots of mammals)
Four main parts of geologic time scale (based on fossils)
Dinosaurs and first flowering plants
Appearance of fish, plants, insects, reptiles, etc.
Before shells and hard parts
If Earth history were 1 year
Observe this scene and then think of options for all the ways in which a crater could form
Rim of crater has angular blocks of fractured rock
Observe this geologic cross section across the crater. The crater is within sedimentary layers.
List predictions that arise from each model and how you could test each prediction.
What type of data would you like to have?
Layers bent upward
Possible explanations:(1) rising salt, (2) rising magma, and (3) meteoroid impact
List at least one prediction that follows from each explanation
What types of information would you like to know to further constrain the origin of the dome?
Compare the shapes of the continental edges on opposite sides of the Atlantic Ocean
East coast curves in, Africa curves out
Corner of Brazil matches indention in Africa
From inside front cover
Continents fit back together because once joined
Directions ice sheets moved on each continent
Go, my sons [and daughters…], climb the mountains, search the valleys, the deserts, the seas shores, and the deep recesses of the earth. Mark well the various kinds of minerals, note their properties and their mode of origin.
(Petrus Severinus, 1571)