There is darkness without the Lord

Exodus 10:21-29
The plague of Darkness. No one could see anyone else or leave his place for three days. Yet all the Israelites had light in the places where they lived.
For three days the light of the sin is blotted out by 'thickness'(probably a khamsin duststorm)
Why?
Without God there is darkness.
The plagues occurred over a period of six months to a year. In each case God chose to use natural disorders to confound Pharaoh and the gods of Egypt.
He caused the 'Nile-god' to bring ruin, not prosperity; the frogs to bring disease instead of fruitfulness; the power of Re, the sun-god, was blotted out.
The whole sequence of events follows a logical pattern which could have started with unusually high flooding of the Nile, bring down thick red clay from Ethiopia or red algae(藻類) which polluted the water.
However it happened, this was no mere 'chance' - God was demonstrating his absolute control. He distinguished between his people and the Egyptians.
He controlled the extent and the areas affected by each plague. He announced the timing of each, and could all a halt at any time in answer to prayer.
How?
The Lord has absolute control in nature and all in universe. God listen to our prayer and answer at any time He decides. The Lord bring light into the darkness.