Banded iron formations are composed of alternating light and dark bands of chert.
<h3>What is chert?</h3>
Banded iron formations are made up of alternating light and dark chert bands.
Chert is a sedimentary rock that forms in a variety of ways and is almost entirely composed of silica (SiO 2).
When the siliceous skeletons of marine plankton are dissolved during diagenesis, silica precipitates from the resulting solution, biochemical chert is formed.
Chert layers, which occur as irregular beds or rounded nodules within limestone formations, are common in eastern Kansas.
Because it is harder than limestone, chert is more resistant to erosion.
The Flint Hills' chert-topped hills are the result of the landscape's uneven erosion.
Therefore, banded iron formations are composed of alternating light and dark bands of chert.
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A rainforest has more biodiversity than a temperate forest because of seasonality and location. ... The freezing temperature decreases the temperate forests biodiversity because fewer plants and animals can live in sub-freezing temperatures.
