Subsurface ocean currents continually circulate from the warm waters near the equator to the colder waters in other parts of the world. What is the main cause of these currents? 

• differences in the topography along the ocean floor 
• differences in density of ocean water 
• the rotation of Earth on its axis 
• movement of the jet stream 

What is most responsible for the presence of groundwater in an area? 

• the movement of water from a confined aquifer into surface water 
• the movement of surface water and precipitation through soil and rock
• the movement of water from streams and rivers to watersheds
• the movement of surface water through impermeable rock 

Which is the most common contamination source for freshwater resources? 

• runoff 
• digging wells
• melting of glaciers
• lightning

Which layer of the soil profile would be affected the most by weathering and erosion?

• 1
• 2
• 3
• 4

Which of the following isn’t a factor/force involved with erosion?

• gravity
• wind
• tension
• water

One complete revolution of the Earth around the sun takes about

• one rotation
• half a year
• one year
• one season

The Earth takes about __________________ hours to complete one rotation of its axis.  

• 12
• 24
• 14
• 28

Name the phase of the moon for letter c

• New Moon
• Full Moon
• Waxing Crescent
• Waning Crescent

When a hemisphere is pointed directly towards the Sun, what season will it be?

• Fall
• Winter
• Spring
• Summer

Warm air moving north from the Gulf of Mexico is:

• continental tropical
• continental polar
• maritime tropical
• maritime polar