Most of the substances are naturally-occurring minerals that have been dissolved by the water as it moves through the soil and rock layers.
(Most of the substances; are; naturally-occurring minerals that have been dissolved by the water) (naturally-occurring minerals; have been dissolved; by the water; T:as it moves through the soil and rock layers) (it; moves; through the soil and rock layers)
Most of the substances naturally-occurring minerals it
are have been dissolved moves
naturally-occurring minerals that have been dissolved by the water
by the water T:as it moves through the soil and rock layers
through the soil and rock layers