QUESTION 13 Chapter 4.5.1. Which have higher impact velocities at Earth\'s orbit

Question

QUESTION 13 Chapter 4.5.1. Which have higher impact velocities at Earth's orbit? a. Asteroids o b. Comets QUESTION 14 Chapter 4.5.2. What is the most likely reason why there are a comparatively small number of distinct craters on the Earth? o a. There are very few objects in space whose orbit crosses the Earth's orbit. OBThe surface of the Earth is continually being re-shaped by erosion and geological activity O c. The Moon protects the Earth from impacts. o d Jupiter protects the Earth from impacts. QUESTION 15 Chapter 4.5.2.Which is not one of the three factors the influence the shapes of craters of varying size? O a The surface gravity of the body O DThe thickness of the lithosphere O The strength of the impacted rock o d Whether the impact occurs close to or away from the equator

Explanation / Answer

13. b. Comets.

Comets can travel three time faster than the Near Earth Asteroids (NEAs) at the time of impact.

14. d. Jupiter protects the Earth from impacts.

It is due to Jupiter's huge gravity that changes the path of the comets and meteorite away from Earth.

15. d. Whether the impact occurs close to or away from the equator.

Shape of craters depends on the size, velocity of the meteorite and the surface of the planet on which the meteorite is falling.

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