溶よう岩がん台だい地ち

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Meanings

1

noun

lava plateau

A flat, elevated landform created by successive lava flows. Used in geography and earth science.

melt, dissolve, thaw

岩boulder, rock, cliff

台pedestal, a stand, counter for machines and vehicles

地ground, earth

溶よう岩がん
溶岩 means 'lava' itself, while 溶岩台地 refers specifically to the plateau formed by lava.
台だい地ち
台地 is a general term for 'plateau' or 'tableland', not necessarily of volcanic origin.

Compound of 溶岩 (lava) and 台地 (plateau). The exact historical derivation is uncertain, but the term is a straightforward modern geological compound.