How could a flood destroy every living thing?

“And all flesh died that moved upon the earth, both of fowl, and of cattle, and of beast, and of every creeping thing that creepeth upon the earth, and every man: All in whose nostrils was the breath of life, of all that was in the dry land, died.”
GENESIS 7:21-22

Noah’s Flood was much more destructive than any 40-day rainstorm ever could be. Scripture says that the “fountains of the great deep” were broken open. In other words, earthquakes and volcanoes, with geysers of molten lava and scalding water, were squeezed out of the earth’s crust in a violent, explosive upheaval. These fountains were not stopped until 150 days into the Flood, so the earth was literally churning underneath the waters for about five months!

The local floods, volcano eruptions, and earthquakes recorded by humans in more recent centuries, though clearly devastating to life and land, are tiny in comparison to the worldwide catastrophe that destroyed God’s original perfect earth. All land animals (and people) not on board the Ark were destroyed in the Flood waters, billions of which were preserved in the great fossil (Flood) record we see today.

Sign of Design: It’s often overlooked that the properties of a cell which make it alive cannot be explained by just referring to the chemical properties of a car cannot be explained by the properties of rubber, metal, plastic, and so forth.