iClicker exam 1 Flashcards
1
Q
The hypothesis that explains the formation of the solar system is referred to as:
A
nebular hypothesis
2
Q
According to the nebular hypothesis, the inner planets are dense and rocky because:
A
the lighter gases were blown away by the Sun’s radiation.
3
Q
Nebulae are composed primarily of which elements?
A
hydrogen and helium
4
Q
How old is the Earth?
A
approx. 4.5 billion years ago
5
Q
Earth’s magnetic field is believed to be generated in this region
A
outer core
6
Q
Which region in the Earth consists primarily of solid iron?
A
inner core
7
Q
Which region in the Earth is molten?
A
outer core
8
Q
The inner core is solid and the outer core is liquid
A
true
9
Q
How thick is the oceanic crust?
A
approx. 7 km
10
Q
under mountain ranges, continental crust can be up to ___ km thick:
A
100
