________ collection and ________ collection are used to harness solar energy for consumption.
A) Magnetic; hydraulic
B) Human; mechanical
C) Passive; active
D) Aquatic; filtration
Question 2
Although rare in Earth's crust, some of the most important deposits of uranium are associated with ________.
A) lake sediments
B) placer deposits
C) ancient sand dunes
D) geysers