"The Silurian is a geologic period and system spanning 24.6 million years from the end of the Ordovician Period, at 443.8 million years ago, to the beginning of the Devonian Period, 419.2 Mya.<span> <span>Wikipedia."
https://www.google.com/search?q=He+Silurian+period+occurred&rlz=1C1RUCY_enUS760US760&oq=He+Silurian+...
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Sometimes if the like is shallow enough the lake can grow plants at the bottom. If the lake where the plant is, is rather deep, then the sunlight can't reach the plant and plants need sunlight for growth and agriculture.
B- Tectonic is the answer. A divergent boundary is when two plates move away from each other, a transform boundary is when plates slide against each other and a convergent boundary is when two plates collide.
<span>The world in spatial terms. ...Places and regions. ...Physical systems. ...Human systems. ...Environment and society. ...<span>The uses of geography.</span></span>
