Question 1
The three most abundant elements in Earth's crust are
◦ rock, water, and tectonics.
◦ magnesium, potassium, and oxygen.
◦ iron, aluminum, and granite.
◦ oxygen, silicon, and aluminum.
Question 2
The transition zone from the outer core to the mantle is ________ and is known as the ________ discontinuity.
◦ uneven; Gutenberg
◦ uneven; Moho
◦ smooth; Gutenberg
◦ smooth; Moho