The limestone cycle starts in the ocean hundreds of millions of years ago when tiny creatures with calcium rich shells or bodies died and littered the ocean floor with increasing sediment. From the immense weight of the water above, the pressure compacted these layers and cemented them over time. Then through geological activities like magma pressing up against the ocean floor, tectonic activity and changes in ocean depth and location, these great limestone formations were uplifted above sea level and some towered above the landscape as mountains or plateaus. Now water takes on a new roll and that is one of dissolving the minerals within limestone thereby creating stunning underground caves and caverns. Once again, water takes on a new task, that of carrying those dissolved minerals to be redeposited in the form of stalagmites and stalactites or carrying those dissolved solids back to the ocean where they may be used once again by plants and animals as the cycle continues.
You can find the complete list of materials we used for this unit, including pictures, links and descriptions of each book or kit, videos, resources and more at the blog post that accompanies this video:
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30 май 2024
