Suppose we use a baseball to represent Earth. On this scale, the other terrestrial worlds (Mercury, Venus, the Moon, and Mars) would range in size approximately from that of ________.
A) a golf ball to a baseball B) a dust speck to a basketball
C) a golf ball to a beach ball D) a dust speck to a golf ball
Question 2
A gas heated to millions of degrees would emit
A) mostly radio waves.
B) mostly X-rays.
C) no light, because it is too hot.
D) mostly ultraviolet light.
E) an equal amount of all wavelengths of light.
Earth’s Magnetosphere
Rivers on Mars and Earth
Worldwide Variations in Population and Income Levels Developed countries represent only 18% of the
Earth’s Layered Structure
Orbital Motion of Earth and Other Planets
Cast of a Fossil Dunkleosteus, with a human to illustrate scale