Questions about example sentences with, and the definition and usage of "Earth"

A: "Earth to (person)" is used when someone's not paying attention or when they're spaced out, I think it's from when astronauts are in space and the home base is communicating with them.
"curiosity killed the cat" is a saying used to tell someone that being curious is going to get them into trouble or is going to be dangerous, so they should let something go and not wonder about it/investigate it.

A: it means Humble

A: It's an expression. Like someone is not happy to see what he is seeing.

A boy see his project torn apart he would likely say because of shock
"What on earth?! Who did this?!"

A: Yes people usually use "on earth" to emphasize their frustration about something. Think of it as an adjective, and yes it's quite impolite hahah. For example:
How (on earth) do you do this?
Why (on earth) is this happening?
What (on earth) is going on?

A: Be humble or modest. Don’t let your successes or achievements get to your head and be the reasons for you to look down on other people. It could also mean to remember where you came from or where you started. :)

A: Down to earth means a sensible practical person.

A: It is unnatural to say “on the earth”. You should say on earth to make it natural.

What on earth did you do with your hair?
There are different sorts of mammals living on earth.

A: There is (1) planet Earth, and (2) earth that you can hold in your hands (dirt).

Ex. Earth = Planet:

1) We all live on the Earth
2) I saw something that was not of this Earth
3) Where on Earth did you find that?

Ex. earth = dirt:

1) The man held the earth in his hands
2) The excavator dug a huge hole in the earth

There is essentially no difference in meaning, but the context of the sentence slightly changes the meaning, making it more global (planet earth), or local (dirt).

A: what on earth are you doing with that?
what on earth are you doing here?
what on earth is going on right now?

A: The boy/girl is down to earth

A: Earth:
1. soil, dirt
2. the planet we live on

land: a large amount of earth or location on the ground that isn't underwater ( a country. a property)

A: The first asks about what happened while the second asks about why something happened:
-What on earth did you say to your boss?
- Get lost.
- Why on earth did you say that?
- He pissed me off.

A: “we believed the earth to be flat” is the only one that’s right.

Note: This would only be used in a story or monologue. It’s hard to tell why, but it’s referencing a different timeline of events. 使い方: 物語の場合

A: Earth is more general and can refer to just about any kind of ground material, dirt, rocks, clay, as long as it is underfoot. Soil is a specific kind of earth that most plants grow in
Or that magic dust from Final Fantasy Unlimited (am I the only one who watched that show?)

A: Generally speaking...
An earth - incorrect usage
The earth - 大地
earth - 土
Earth - 地球

A: The Earth orbits the Sun.
The Earth is orbiting the Sun.
The Earth orbits around the Sun.
The Earth is in the orbit of the Sun.

A: "What were you doing up until now?" is probably the best translation.

"What on earth were you doing?" is a bit rude and informal. For context, "what on earth" often translates as "一体何を".

A: It will be harmful to our health, so let’s not make our Earth dirty anymore. (I) hope you enjoy watching this video. (文法的に合っています)

こちらの方が自然だと思います:
It would be harmful for our health, so let’s not make a mess of the Earth anymore. (I) hope you enjoy the video.

A: you normally use this phrase when you want to describe someone who is very easy to get along with, sincere, realistic or practical.

Example: “I met Sam yesterday and he was really down to earth. I like him a lot.”

A: Check the question to view the answer

A: Who in the world would ever try chocolate sushi?

A: × What on earth could it be possible for me to do that?
✓ How on earth could it be possible for me to do that?

A: 2 sounds great. Perfectly natural :)

A: × The earth is round shaped.
✓ The earth is round. | The earth is round - like a ball.

A: Or
If you’re not really upset, don’t place any emphasis.