The dark maria on the moon are
A) layers of dark meteoritic debris from impacts
B) layers of darker rock just beneath the surface which have been uncovered by impacts
C) huge impact basins filled in by lava flows
D) oceans of liquid water covering the surface
Question 2
If the inductance and the capacitance both double in an LRC series circuit, the resonant frequency of that circuit will
A) decrease to one-half its original value.
B) decrease to one-fourth its original value.
C) decrease to one-eighth its original value.
D) increase to twice its original value.
E) increase to four times its original value.
Oasis in space: earthrise over the moon's horizon.
Dark Matter
Ellsworth Kelly, Three Panels: Orange, Dark Gray, Green.
Tissue layers in the bronchi.
Phases of the Moon
Dark Blue Eye Color