The term "El Nino" phenomena in December in Peru explains
A. warming of an otherwise cold current which brings heavy rain and flooding.
B. cooling of an otherwise warm current which brings high temperatures and drought.
C. warming of an otherwise cold current which brings high temperatures and drought.
D. cooling of an otherwise cold current which brings heavy rain and flooding.
Answer: A
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How did the density and buoyancy of the materials that formed Earth affect its internal structure?
a. Denser materials, such as nickel and iron, pushed their way up to the Earth's surface and became it's crust, whereas less dense, more buoyant materials such as silicon and aluminum, were displaced down to the Earth's core. b. Denser materials, such as silicon and aluminum, pushed their way up to the Earth's surface and became its crust, whereas less dense, more buoyant materials such as nickel and iron, were displaced down to the Earth's core. c. Denser materials, such as nickel and aluminum, sunk to the Earth's center and became its core, whereas less dense, more buoyant materials such as iron and aluminum rose to the Earth's surface and became its primitive crust. d. Denser materials, such as nickel and iron, sank to the Earth's center and became its core, whereas less dense, more buoyant materials such as silicon and aluminum, rose to the Earth's surface and became its primitive crust. e. Denser materials, such as silicon and aluminum, sank to the Earth's center and became its core, whereas less dense, more buoyant materials such as nickel and iron rose to the Earth's surface and became its primitive crust.
Which region is largely free from environmental problems?
A) Europe B) North Africa and the Middle East C) Sub-Saharan Africa D) South Asia (Indian Subcontinent) E) All of the above have major environmental problems.
The principle of ________ states that organisms succeed one another in a definite, determinable order that can be used to recognize a specific time period
A) correlation B) superposition C) fossil succession D) lateral continuity
Organisms contribute to soils formation by ________
A) stirring the soil to allow air infiltration B) degrading organic matter to form humus C) contributing organic matter to the soil D) all of the above