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Flashcards in Earth sci- chapter 1 Deck (17):
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Scientific method

Process in which researchers gather facts through observations and formulate scientific hypotheses and theories

1

Hypothesis

Idea that explains a given phenomena
Criteria: based on objective observations & must be testable
Tested and tested until falsified
If can't be falsified it becomes a theory

2

Theory

Well tested and widely accepted view that explains certain observable facts

3

Earths spheres

Hydrosphere
Atmosphere
Biosphere
Geosphere

4

Hydrosphere

Water portion of planet
One of the traditional subdivisions of earths physical environment

5

Atmosphere

Gaseous portion of earth
90% occurs within 10 miles of earths surface
Energy changes btwn atmosphere & space and atmosphere & earths surface effects weather and climate

6

Biosphere

Parts of the solid earth, hydrosphere, and atmosphere on which all living organisms can be found

7

Geosphere

Solid earth
Largest of all spheres
6400 km to center of earth
Made up of core mantle and crust

8

Core

Dense inner sphere
Iron and nickel with a bit of oxygen silicon and sulfur
Outer core- liquid 2260 km thick
Movement of metallic iron that generates magnetic field
Inner core- solid 1216 km thick
Solid due to pressure

10

Mantle

82% earths volume
solid high density rock
2890 km thick
upper and lower mantle
olivine and silica rich

11

upper mantle

660 km deep
top is lithosphere
bottom asthenosphere

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lithosphere

sphere of rock
consists of entire crust and upper most mantle
forms earths cool rigid outer shell
100 km thick

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asthenosphere

weak sphere
solid but not mobile
easily deformed
100-650 km
upper part some melting

14

lower mantle

strengthens with depth bc of pressure
very hot and gradual flow

15

crust

low density rock
continental and oceanic crust
thickness 7-70km

16

mesosphere

lower
mobile/fluid

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earth system

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