Which rock layer is the youngest?
a. limestone
b. lava
c. shale
d. sandstone

In north america, most winter storms form when cold, dry air from interacts with warm, moist air from

[ou.01jthe greatest speed with which any physical object moves is 300,000 km/soundsec. which of the following has a speed of 300,000 km/sec? a.light in water b.light in vacuum c.sound in air. d. sound in water

What weather system might be occurring if the pressure gradient decreases and fish harvests in peru are weaker than normal