Explanation:
Terresterial comes from the greek work "terra", which means Earth. So when you hear the word "terresterial " think that it means "like Earth". More specifically, it means that a planet is SOLID, like the Earth is. So, to figure out the answer to your question, let's list the planets starting with the ones closest to the sun and work out way out toward deep space. We can also describe each planet a bit as we list them.
Mercury - Closest to the Sun and, because of that, its very hot here. A lot of the ground on this planet is lava made of molten metal which is a liquid BUT there is also solid ground so it is terresterial. âś“
Venus - 2nd closest to the Sun. There is ground here, so it's terresterial. âś“
Earth - 3rd closest to the sun. There is solid ground here too so... Terresterial âś“
Mars - Also Solid. Terresterial âś“
Jupiter - Jupiter is made of Gas. If you went there, there would be nothing solid to walk on, but instead simply pass through it like it was a cloud. Therefore it is NOT terresterial
Saturn - Also a "Gas Giant" plant. (They are called gas giants because these planets are huge! You could fit 764 planet Earths inside of Saturn and over 1300 Earths could fit inside Jupiter!) Gas = NOT terresterial
Uranus - Another Gas Giant. Not terresterial
Neptune - The last of the gas giant planets and the furthest from the Sun. Again, its made of gas so its... not terresterial!
If you have trouble remembering the order, try memorizing this:
  "My  -  Very  -  Epic - Mother - Just  -  Served  -  Us  -  Nachos"
Mercury - Venus - Earth - Mars - Jupiter - Saturn - Uranus - Neptune
Let me know if you need any more help! I am a scientist at NASA and my research focuses on all the planets you're currently learning about! Im happy to help out where I can.
