Petrified wood is an example of a fossil formed by ________.
a. permineralization replacing original cellulose of the wood
b. cast and mold preservation
c. direct preservation
a. permineralization replacing original cellulose of the wood
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Which of the following has the lowest water solubility?
A) butanal B) heptanal C) hexanal D) pentanal
A(n) ____________________ is an intense rotating column of air that extends downward from the base of a thunderstorm with a circulation reaching the ground
Fill in the blank with correct word.
The three varieties of seeps on the seafloor include hypersaline, hydrocarbon, and ________
A) abyssal plain seeps B) deep-sea trench seeps C) mid-ocean ridge seeps D) seamount seeps E) subduction zone seeps
Savannas usually include some trees dotting the landscape. This type of savanna is known as ________ savanna
A) lush B) rainforest C) arboreal D) park E) bunchgrass