Explain how and why there are large areas off of the Louisiana coast that support no marine life?
What will be an ideal response?
A dead zone in the Gulf of Mexico exists off the coast of Louisiana because of oxygen depleted water from the Mississippi River. The Mississippi River Basin includes major agricultural states like Kansas, Iowa, and Illinois. Runoff from fields has contributed vast amounts of nutrients to the river systems in this basin. The nutrients promote the growth of large algae blooms. When the algae dies, most of the dissolved oxygen is depleted by the bacteria that eat the dead algae. Most aquatic species cannot survive in such low oxygen levels.
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Which of the following statements is true about biodiversity?
A. The age of an ecosystem can be an indicator of biodiversity B. We know why biodiversity increases at lower latitudes C. There are few species left on Earth to discover D. Biodiversity is evenly distributed across the planet
How did the cephalopods of the Cenozoic seas differ from the cephalopods of the Mesozoic? What will be an ideal response?
The cracking and fracturing of a material subjected to stress is called:
a. Elastic deformation b. Ductile deformation c. Brittle deformation d. Plastic deformation
The occurrence of a halo tells you that
A) the ice crystals are columnar in shape and are horizontally-oriented as they fall. B) the ice crystals are platelike in shape and are horizontally-oriented as they fall. C) the ice crystals are columnar in shape and are tumbling while they fall. D) the ice crystals are platelike in shape and are tumbling while they fall.