Which of the following layers of the Earth is unique among the terrestrial planets?
A) hydrosphere
B) ionosphere
C) mantle
D) crust
E) core
Question 2
What are constellations?
A) groups of galaxies gravitationally bound and close together in the sky
B) groups of stars making an apparent pattern in the celestial sphere
C) groups of stars gravitationally bound and appearing close together in the sky
D) ancient story boards, useless to modern astronomers
E) apparent groupings of stars and planets visible on a given evening
A scene from a kelp forest off the west coast of North America. Like terrestrial forests, kelp fores
Astronomers identified 12-billion-year-old white dwarf stars only 100 light years away from Earth
Temperature profile of the Uranian troposphere and lower stratosphere. Cloud and haze layers are als
Layers of Rock Laid Down by Water
Umberto Boccioni, Unique Forms of Continuity in Space.
Planets