plzz help earth science?

[**Penis Smooch]

1)Which of the following is important in accumulating and removing sands that result in shifting barrier islands?
tides
geostrophic currents
rip currents
longshore currents

2. Which of the following factors interact to create currents that are 50 m deep?
wind, temperature, and salinity
density, temperature, and salinity
wind, friction, and the Coriolis effect
temperature, gravity, and the Coriolis effect


3. Which of the following gases gets added to seawater primarily by geological processes?
nitrogen
oxygen
methane
argon

4. Which of the following conditions will produce the largest waves?
strong, short duration winds in a small fetch
weak, short duration winds in a small fetch
weak, long duration winds in a large fetch
strong, long duration winds in a large fetch