The singular possessive form of earth is earth's (the earth's atmosphere).
The correct singular possessive for "ocean" is "ocean's."
The possessive form for the noun soil is soil's.
earth's
The possessive form of the noun lava is lava's.Example: The lava's heat could be felt at a great distance.
The plural possessive form of "volcanoes" is "volcanoes'".
The singular possessive form is week's.
The singular possessive form is classmate's.
The possessive form is Amos's.
The singular possessive form for the noun gypsy is gypsy's.
The singular possessive form for country is county's.
The singular form for the plural noun countries is country; the singular possessive form is country's.
singular possessive: boy'splural possessive: boys'
The singular possessive form is speculum's.
The singular possessive form is aircraft's.
The singular possessive form is frontiersman's.
The singular possessive form is contralto's.
The singular possessive form is herd's.