Question 1

The moon is no longer geologically active because

Accepted Answer

The moon is too small to retain enough internal heat to sustain geological activity over billions of years.

Question 2

Slow surface evolution on the moon is limited to

Accepted Answer

B

Question 3

Which hypothesis,concerning the formation of the moon,makes predictions that best fit the observed lunar data?

Accepted Answer

The large impact hypothesis suggests that the Moon formed from the debris of a collision between Earth and a Mars-sized body. This hypothesis best fits the observed data, such as the Moon's composition and its orbit, compared to other hypotheses.

Question 4

The time it takes Mercury to complete a solar day (the time from sunrise to sunrise)

Accepted Answer

A solar day on Mercury is equal to two revolutions around the Sun due to its 3:2 spin-orbit resonance, where it rotates three times on its axis for every two orbits around the Sun.

Question 5

Mercury has a mass of 3.3*10²³ kg and a radius of 2.4*10⁶ m.The gravitational constant is 6.7*10 ^- ¹¹ N.m²/kg².What is Mercury's escape velocity?

Accepted Answer

The escape velocity can be calculated using the formula $ v_e = \sqrt{\frac{2GM}{R}} $. Substituting the given values, the escape velocity for Mercury is approximately 4.3 km/s.

Question 6

The surface temperature of Mercury is

Accepted Answer

The answer of The surface temperature of Mercury is
...

Question 7

As the moon revolves around Earth,

Accepted Answer

The moon is tidally locked with Earth, meaning it rotates on its axis once for every orbit around Earth, keeping the same side facing Earth.

Question 8

The co-accretion hypothesis for the formation of the moon suggests that the moon and Earth formed as a double planet from the same cloud within the solar nebula.This hypothesis predicts that

Accepted Answer

The co-accretion hypothesis suggests that the moon and Earth formed together from the same material, so they should have identical compositions and densities. However, the moon's mass and radius are much smaller than Earth's, and their surfaces are quite different, with the moon lacking plate tectonics.

Question 9

The Earth's moon is airless and inert because its mass is ____ Earth's.

Accepted Answer

The Moon's mass is much less than Earth's, which means it has a weaker gravitational pull and cannot retain a significant atmosphere, making it airless and inert.

Question 10

The presence of breccias among the lunar rock samples shows that

Accepted Answer

Breccias are formed when larger rock fragments are broken apart and then reassembled by a matrix of smaller fragments. This is commonly caused by meteorite impacts, which can fragment the surface of the moon and mix up the layers of material. So, the presence of breccias among the lunar rock samples indicates that the lunar surface has been subjected to frequent meteorite impacts.

Question 11

In contrast to the Earth and Mercury,the fact that the Earth's moon has no magnetic field implies that

Accepted Answer

The lack of a magnetic field on the Moon suggests that it lacks a molten iron core, which is necessary for generating a magnetic field through the dynamo effect.

Question 12

That Mercury has a large iron core is evidenced by

Accepted Answer

The large mean density of Mercury is the best evidence for its large iron core. The lobate scarps and lava flows near Caloris Basin do not necessarily provide direct evidence for the core composition.

Question 13

The airless and inert nature of the Earth's moon results in ____ craters per unit area as on Earth.

Accepted Answer

The Moon has more craters per unit area than Earth because it lacks an atmosphere to erode or weather them away, and there is no geological activity to reshape its surface.

Question 14

The presence of vesicular basalts among the lunar rock samples shows that

Accepted Answer

The presence of vesicular basalts indicates that molten lava once flowed over the lunar surface.

Question 15

If Mercury is 1.5*10⁸ km from Earth and has a diameter of 2,400 km,what is its angular diameter as viewed from Earth?

Accepted Answer

The angular diameter in radians is calculated by dividing the actual diameter by the distance. Converting this to seconds of arc, we find it to be approximately 3.3 seconds of arc.

Question 16

The fission theory of the moon's origin has been criticized because

Accepted Answer

The fission theory suggests the moon was once part of Earth, but the moon's composition, particularly its lack of iron compared to Earth, contradicts this theory.

Question 17

The lunar maria are

Accepted Answer

The lunar maria are the large, dark, flat areas on the Moon's surface that were formed by ancient volcanic activity. They are located primarily in the low-lying areas of the Moon's surface and are composed of solidified lava flows.

Question 18

The moon's highlands

Accepted Answer

The moon's highlands are older than the maria, as they are heavily cratered and date back to the early history of the moon.

Question 19

The escape velocity of the Earth's moon is ____ that of the Earth.

Accepted Answer

The escape velocity of the Moon is less than that of the Earth because the Moon has a smaller mass and gravitational pull compared to Earth.

Question 20

Why is it surprising that Mercury's magnetic field is strong enough to be measured (> >Earth's moon's),yet significantly weaker than Earth's magnetic field?

Accepted Answer

The answer of Why is it surprising that Mercury's magnetic...

Quiz 21: The Moon and Mercury: Comparing Airless Worlds

The moon is no longer geologically active because

Slow surface evolution on the moon is limited to

Which hypothesis,concerning the formation of the moon,makes predictions that best fit the observed lunar data?

The time it takes Mercury to complete a solar day (the time from sunrise to sunrise)

Mercury has a mass of 3.310²³ kg and a radius of 2.410⁶ m.The gravitational constant is 6.7*10 ^- ¹¹ N.m²/kg².What is Mercury's escape velocity?

The surface temperature of Mercury is

As the moon revolves around Earth,

The co-accretion hypothesis for the formation of the moon suggests that the moon and Earth formed as a double planet from the same cloud within the solar nebula.This hypothesis predicts that

The Earth's moon is airless and inert because its mass is ____ Earth's.

The presence of breccias among the lunar rock samples shows that

In contrast to the Earth and Mercury,the fact that the Earth's moon has no magnetic field implies that

That Mercury has a large iron core is evidenced by

The airless and inert nature of the Earth's moon results in ____ craters per unit area as on Earth.

The presence of vesicular basalts among the lunar rock samples shows that

If Mercury is 1.5*10⁸ km from Earth and has a diameter of 2,400 km,what is its angular diameter as viewed from Earth?

The fission theory of the moon's origin has been criticized because

The lunar maria are

The moon's highlands

The escape velocity of the Earth's moon is ____ that of the Earth.

Why is it surprising that Mercury's magnetic field is strong enough to be measured (> >Earth's moon's) ,yet significantly weaker than Earth's magnetic field?

Quiz 21: The Moon and Mercury: Comparing Airless Worlds

The moon is no longer geologically active because

Slow surface evolution on the moon is limited to

Which hypothesis,concerning the formation of the moon,makes predictions that best fit the observed lunar data?

The time it takes Mercury to complete a solar day (the time from sunrise to sunrise)

Mercury has a mass of 3.3*1023 kg and a radius of 2.4*106 m.The gravitational constant is 6.7*10 - 11 N.m2/kg2.What is Mercury's escape velocity?

The surface temperature of Mercury is

As the moon revolves around Earth,

The co-accretion hypothesis for the formation of the moon suggests that the moon and Earth formed as a double planet from the same cloud within the solar nebula.This hypothesis predicts that

The Earth's moon is airless and inert because its mass is ____ Earth's.

The presence of breccias among the lunar rock samples shows that

In contrast to the Earth and Mercury,the fact that the Earth's moon has no magnetic field implies that

That Mercury has a large iron core is evidenced by

The airless and inert nature of the Earth's moon results in ____ craters per unit area as on Earth.

The presence of vesicular basalts among the lunar rock samples shows that

If Mercury is 1.5*108 km from Earth and has a diameter of 2,400 km,what is its angular diameter as viewed from Earth?

The fission theory of the moon's origin has been criticized because

The lunar maria are

The moon's highlands

The escape velocity of the Earth's moon is ____ that of the Earth.

Why is it surprising that Mercury's magnetic field is strong enough to be measured (> >Earth's moon's) ,yet significantly weaker than Earth's magnetic field?

Mercury has a mass of 3.310²³ kg and a radius of 2.410⁶ m.The gravitational constant is 6.7*10 ^- ¹¹ N.m²/kg².What is Mercury's escape velocity?

If Mercury is 1.5*10⁸ km from Earth and has a diameter of 2,400 km,what is its angular diameter as viewed from Earth?