(Q).
Q: To figure out the height of a wave you measure the distance between the crest and what? Choices: - drift - core - crater - trough A:
(A).
trough

(Q).
Q: What is defined as an antigen that causes an allergy? Choices: - an expectorant - a disinfectant - a pollutant - an allergen A:
(A).
an allergen

(Q).
Q: When magma heats groundwater, it may come to the surface as a hot spring or a what? Choices: - pond - cave - volcano - geyser A:
(A).
geyser