QUESTION 3 rial planets and moons tend to show more cratering compared to large

Question

QUESTION 3 rial planets and moons tend to show more cratering compared to large terrestrial planets and moons because smaller terrestrial planets O a have lower internal heat and less geological activity. O b. are protected by atmospheres. O c. are located in the inner solar system. d.are hit by interplanetary debris more often. QUESTION4 Humankind has landed spacecraft only on some of the terrestrial planets and our Moon. O True O False QUESTION 5 All planets and dwarf planets rotate about their spin axes and orbit the Sun in the same direction. O True O False

Explanation / Answer

3)have lower internal heat and less geologic activity.

small terrestrial planets and moon show large number of craters on the surface. for example Mercury and Moon shows greater number of craters, these bodies are small and do not have an atmosphere due to high temperature and less gravity. so the surface craters or impact marks do not clear by the action of wind, these bodies have a low internal heat, which is a driving force for the tectonic activities, which are capable of changing the crust of these planets. so the absence of both the factors allows the craters to stay as it is.

4) False.

human kind has landed the spacecrafts on terrestrial planets except mercury and moon many times.

not only on the terrestrial planets we have send different probes to all planets some of them landed on the surface and others orbited the planets and collected the data with out contact,. Huygens spacecraft send by a collabarative work of NASA and European space gency ha landed on Titan, moon of saturn. it is unable to land on the Jovian planets since they do not have a solid surface (Gas Giants), in 2017 cassini descended to saturn and mmoves through the gas regions.

5) False

most of the planets have the same direction in their own axis rotation and rotation around sun that is in anti clock wise direction. but venus rotate in clockwise in retrograde motion, uranus also shows this retrograde motion.it canbe due to the interaction with large bodies which changed their angular momentum

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