Why do most caves form in limestone rock formations?
A. Limestone is the most common kind of rock on Earth.
B. Limestone is a soft rock.
C. Limestone chemically reacts readily with acidified groundwater.
D. Limestone dissolves in rainwater.
Answer: C
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Which natural law explains why there is more energy at the trophic level occupied by wolves and bears then the trophic level represented by deer and mice?
A. Second law of thermodynamics B. Law of conservation of energy C. Law of conservation of momentum D. Law of gravity
In which of the following orders of measurement are the lengths of longwaves in the middle and upper troposphere usually described?
A. tens of km B. hundreds of km C. thousands of km D. millions of km
________ play a crucial role in returning nutrients essential for plant growth directly to the soil
A) Chemical decomposers B) Herbivores C) Scavenging decomposers D) Producers
Oxygen and silicon are so abundant in Earth's crust that their percentages dwarf those of all other elements.
Answer the following statement true (T) or false (F)