Answer:
Ordovician extinction
.
Explanation:
The Ordovician extinction was an event that occurred around 450 million years ago and caused the <u>disappearance of 60% of marine species.</u>
This event was caused by global cooling which resulted in the <u>drop of the sea level</u>. This change mostly affected the species that developed life in the deep, depriving them of their natural habitat.
In Egypt it was very important to them in which land was theirs and which wasn’t. Though most of the land was owned by the Pharoah.
You are seeing the conservation of energy.
Hope this helps!
<u>Physical geography</u> is the study of the natural features, processes and patterns that occur on the Earth's surface.