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
Humanmade pollutants may be driving the expansion of the Earth’s tropical belt seen
Earth with Rings
The rock cycle and the Earth’s physical environment
Humans are related to Earth’s other organisms
Planet Z-34 has a mass equal to 1/3 that of Earth, a radius equal to 1/3 that of Earth, and an ...
Earth 150 Million Years Ago