noun, noun which may take the genitive case particle 'no'
on Earth; on the earth
Refers to something existing or happening on the surface of the Earth, often used in scientific or geographical contexts.
地球上には多様な生物が存在する。
Diverse life forms exist on Earth.
これは地球上で最も高い山です。
This is the highest mountain on Earth.
Many living things exist on Earth.
This is the tallest mountain on Earth.
All living things on Earth need water.
地球 is the noun for 'the Earth' (the planet itself), while 地球上 is the locative expression meaning 'on Earth/on the earth's surface'; learners sometimes drop or add 上 incorrectly.
Compound of 地球 (chikyū, 'Earth') + 上 (jō, 'on, above'). The reading じょう is the standard on'yomi for 上 in this context.