In the Milankovitch theory, the elliptical shape of the Earth's orbit, its axis tilt, and axis precession vary with time. These combined at times to create ____ on Earth
a. day and night
b. seasonal temperature variations
c. daily temperature variations
d. ice ages
e. the constellations
d
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The Mars Rovers found undisputed microfossils, proving life once existed on Mars
Indicate whether the statement is true or false
What are the two main differences between extrasolar planetary systems discovered to date and our Solar System?
A) extrasolar planets tend to be more massive and dense than Jupiter B) extrasolar planet orbits tend to be more eccentric and inclined than in our Solar System C) extrasolar planet orbits tend to be closer and more eccentric than in our Solar System D) extrasolar planet orbits tend to be closer and more circular than in our Solar System E) extrasolar planets tend to be bigger and denser than Jupiter
Dinosaurs were abundant during the
A) Paleozoic era. B) Devonian era. C) Mesozoic era. D) Cenozoic era.
Each of the following statements was either true for Mars in the distant past (early Mars) or is true for Mars today. Sort the statements by dragging each into the correct bin.
