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The planet Earth is made up of three main shells: the very thin, brittle crust, the mantle, and the core; the mantle and core are each divided into two parts; all parts are drawn to scale. Credit: Eugene C. Robertson, USGS.

Geognosy is a lecture focusing on the structure and composition of the astronomical object Earth. It is an independent lecture.

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Quiz[edit | edit source]


1 Yes or No, Geognosy is the science and theory of the constitution of the Earth.


2 The geological study of the Earth's structure and composition is called


3 True or False, All or nearly all spheroidal, rocky objects have a crust.


4 Earth is composed primarily of?

5 True or False, All or nearly all spheroidal, rocky objects have a mantle.


6 Observations of Earth have benefited greatly from what phenomena?

a dense, opaque atmosphere
extensive meteorite cratering
a flattening out
liquid hydrocarbon lakes
the reflected light of silicates

7 True or False, All or nearly all spheroidal, rocky objects have a core.


8 Phenomena associated with Kepler-36b?

has a gaseous surface
about 30% of its mass is iron
about 4.5 times the mass of Earth
has a rocky surface
discovered by the Kepler spacecraft
about 1.5 times as large as the Earth

9 True or False, The XRS aboard the MESSENGER spacecraft maps mineral composition.


10 Yes or No, Evidence from geoseismology, heat flow at the surface, and mineral physics is combined with the Earth's mass and moment of inertia to infer models of the Earth's interior - its composition, density, temperature, pressure.


Hypotheses[edit | edit source]

  1. The constitution of astronomical objects can vary as much as the variation of electromagnetic-type forces or interactions.

See also[edit | edit source]

External links[edit | edit source]

{{Radiation astronomy resources}}