Select the proper description of the silicon-oxygen tetrahedron.
A pyramidal shape with four triangular faces, an oxygen ion at each vertex, and a silicon ion at the center of the pyramid
A pyramidal shape with four triangular faces, a silicon ion at each vertex, and an oxygen ion at the center of the pyramid
A pyramidal shape with three triangular faces, an oxygen ion at each vertex, and a silicon ion at the center of the pyramid
A pyramidal shape with four triangular faces, an oxygen ion at three vertices and one oxygen ion in the center, and a silicon ion at the remaining vertex
A pyramidal shape with three triangular faces, a silicon ion at each vertex, and an oxygen ion at the center of the pyramid
A pyramidal shape with four triangular faces, an oxygen ion at each vertex, and a silicon ion at the center of the pyramid
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Discuss the impacts of human?made pollution on ocean ecosystems
What will be an ideal response?
The daily minimum temperature is usually observed
a. ?at the time of sunset. b. ?near midnight. c. ?several hours before sunrise. d. ?around sunrise. e. ?several hours after sunrise.
Gravel beaches are found on coasts with low wave energy.
Answer the following statement true (T) or false (F)
If one were to map a vertical profile of groundwater resources, which of the following is correct order from top to bottom of an unconfined aquifer?
A) zone of aeration--water table--zone of saturation--impermeable rock B) zone of saturation--water table--zone of aeration--impermeable rock C) zone of aeration--zone of saturation--water table--impermeable rock D) water table--zone of aeration--zone of saturation--impermeable rock E) impermeable rock--zone of aeration--water table--zone of saturation