The ____________ visited North America 500 years prior to the arrival of Columbus. What will be an ideal response?
Vikings
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Which of the geologic principles listed here is incorrectly defined?
a. The principle of cross-cutting relationships states that the fault or intrusion that cuts across several rock layers is older than these layers. b. The principle of superposition states that in an undisturbed sequence of rock layers, the older layers are at the bottom of the sequence and the younger layers are at the top. c. The principle of lateral continuity states that sedimentary beds originate as layers that extend in all directions until they thin out at the edge. d. The principle of inclusions states that an inclusion within a rock layer is older than that layer. e. The principle of original horizontality states that sediment is initially deposited in a horizontal position.
An acid and a base react to form a salt, which consists of positive and negative ions. Which forms the positive ions: the acid or the base? Which forms the negative ions?
A. The acid forms the negative ion, and the base forms the positive ion. B. Because different substances can act as an acid or a base, it depends on the substance you begin with. C. The acid forms the positive ion, and the base forms the negative ion. D. all of the above
A broad, flat surface that extends to the edge of a stream channel is called a:
a. point bar b. floodplain c. natural levee d. crevasse splay
Sublimation is the process of:
A) converting gas into liquid water B) converting solid water into liquid water C) converting liquid water into gas D) converting solid water into gas E) converting liquid water into solid water