Do the Moon and Mercury have an atmosphere?
a. No, they entirely lost their atmospheres early on in their formation.
b. Yes, they are very low-density atmospheres though.
c. Yes, they have an atmosphere just like other terrestrial planets.
Ans: b. Yes, they are very low-density atmospheres though.
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A resting blood pressure of 140 over 90 or more is considered hypertension.
Answer the following statement(s) true (T) or false (F)
Why is Earth's continental crust lower in density than seafloor crust?
A) Continental crust comes from volcanoes while seafloor crust comes from geysers. B) Continental crust is made from a low-density volcanic rock called basalt. C) Continental crust is made as the lowest-density seafloor crust melts and erupts to the surface near subduction zones. D) Continental crust comes from Earth's inner core while seafloor crust comes from the outer core.
Which of the following light rays is drawn incorrectly?
A. a
B. b
C. c
D. d
E. e
Which of the following correctly describes the concept of galactic recycling?
A) New stars are continuously being formed in the Milky Way out of gas that has been ejected from a previous generation of stars. B) In the formation of a star, no matter is wasted as all excess material ends up recycled into planets. C) Stars near the center of the Milky Way are continually recycled to the outskirts of the disk by their orbital motion. D) Life is continuously being spread from star to star in the Milky Way. E) New galaxies are continuously being formed out of gas ejected from a previous generation of galaxies.