ground
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ground
The solid surface of the planet Earth; the ground on which one stands, walks, or builds.
Nach der langen Seereise war er froh, wieder festen Erdboden unter den Füßen zu haben.
After the long sea voyage, he was glad to have solid ground under his feet again.
The word 'Erdboden' (ground) is a compound of 'die Erde' (the earth) and 'der Boden' (the ground/floor). It literally means the ground of the earth and emphasizes the solid surface of the planet.
Der Schatz war tief im Erdboden vergraben.
The treasure was buried deep in the ground.
'Erdboden' (ground) is often an elevated or figurative way of saying 'Boden' (ground/floor). It is used to emphasize the solid, basic surface, especially in contrast to the sea or the air.
Der Regen machte den Erdboden weich und matschig.
The rain made the ground soft and muddy.
The idiom 'etwas dem Erdboden gleichmachen' (to raze something to the ground) requires an accusative object. This object is the thing that is completely destroyed.
Die alte Fabrik wurde dem Erdboden gleichgemacht.
The old factory was razed to the ground.
The expression 'wie vom Erdboden verschluckt' (as if swallowed by the ground / vanished into thin air) is always used with a form of the verb 'sein' (to be). It describes that someone or something has disappeared without a trace.
Mein Schlüssel ist einfach weg, wie vom Erdboden verschluckt.
My key is simply gone, vanished into thin air.
country / countryside / land
'das Land' and 'der Erdboden' can both mean the solid surface you can stand on. 'das Land' is used especially in contrast to water, for example with ships, islands, or coasts. 'der Erdboden' more often means the surface of the earth directly under your feet or under a building. It sounds more concrete and somewhat more factual. If you want to say that you are no longer at sea, 'Land' fits. If you are talking about the ground itself, 'Erdboden' fits better.
Nach dem starken Regen war der Erdboden ganz weich.
After the heavy rain, the ground was very soft.
Nach drei Stunden auf dem Boot waren alle froh, wieder Land zu sehen.
After three hours on the boat, everyone was glad to see land again.