Over the epochs, Indiana has migrated from below the equator to its current position well above. The state has been submerged un
der shallow seas more than once. This periodic rise and fall of waters over the land lead to the deposition of many layers of sediment and the formation of ____________ rock. A) Extrusive B) Igneous C) Metamorphic D) Sedimentary
This periodic rise and fall of waters over the land lead to the deposition of many layers of sediment and the formation of sedimentary (D) rocks.
Sedimentary stones are formed from the matter which is deposited by the passage of water, ice, or wind: minerals, fragments of preexisting rocks or fossils, etc. Indiana's bedrock surface is made out of sedimentary rocks such as:
limestone,
dolomite,
shale,
gypsum,
sandstone,
siltstone.
These rocks are important to Indiana's economy because of their mineable potential.
If these substances become dissolved in the water vapour present in the air then acid rain can form. Acid rain can corrode and kill trees (damaging animal habitats) and wear away older buildings such as those made of limestone.
