What is the difference in the estimated area of the dead zone in Lake Erie between 1990 and 2015?(1 point)%0D%0AResponses%0D%0A%0D%0Aan decrease of 8,000 square miles%0D%0Aan decrease of 8,000 square miles%0D%0A%0D%0Aan decrease of 4,500 square miles%0D%0Aan decrease of 4,500 square miles%0D%0A%0D%0Aan increase of 8,000 square miles%0D%0Aan increase of 8,000 square miles%0D%0A%0D%0Aan increase of 4,500 square miles%0D%0Aan increase of 4,500 square miles
