Weegy: A major consequence of ozone depletion is that more harmful UV rays will reach the earth's surface.
User: A substance that enters Earth's cycles and does harm to living things is
A. freshwater.
B. a pollutant.
C. oxygen.
D. hydrogen.
Weegy: A substance that enters Earth's cycles and does harm to living things is a pollutant.
User: The ancient geographic setting of a region is known as its
A. passive margin.
B. phytoplankton.
C. transgression.
D. paleogeography.
Weegy: The ancient geographic setting of an area is known as its Paleogeography.
User: The Cenozoic Era is best described as the era in which
A. a mass extinction event occurred.
B. dinosaurs emerged.
C. mammals began to dominate the land.
D. multicellular life diversified.
Weegy: The Cenozoic Era is best described as the era in which mammals began to dominate the land.
User: Until the early _______ there were only negligible amounts of free oxygen in the atmosphere.
A. Precambian
B. Mesozoic
C. Proterozoic
D. Cenozoic
Weegy: Until the early Proterozoic there were only negligible amounts of free oxygen in the atmosphere.
User: What is the most abundant fossil fuel?
A. Oil
B. Gas
C. Wood
D. Coal
Weegy: The most abundant fossil fuel is coal.
User: Sand or gravel that naturally forms near Earth's surface is known as
A. aggregate.
B. ore.
C. pollen.
D. bedrock.
Weegy: Sand or gravel that naturally forms near Earth's surface is known as aggregate.
User: The largest mass extinction event in the history of the Earth occurred at the end of the _______ period.
A. Ordovician
B. Permian
C. Cambrian
D. Devonian
Weegy: The largest mass extinction event in the history of the Earth occurred at the end of the PERMIAN period.
User: Dinosaurs emerged during what time period?
A. Paleozoic Era
B. Mesozoic Era
C. Proterozoic Eon
D. Cenozoic Era
Weegy: Dinosaurs ...
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