D. Core
The Earth's magnetic field is believed to be generated by electric currents in the conductive material of its core, created by convection currents due to heat escaping from the core.
Demographic studies will determine the age structure and income structure of people living in a geographic area. Businesses will use this information to help in determining if their business will succeed for given area. Cities will use that information to determine what infrastructure is needed. You would use this to detemine if the area is one you might want to move to or move from.
Answer:
Fast
Explanation:
For a river that deposits small particles where it flows into a sea, the current is likely to be fast.
A fast current is only able to winnow through the sediment and removes the fines.
- On reaching the river mouth with the sea, they settle and get deposited
- For a slow current, there is enough time for the energy to get along with the sediments.
- This ensures the proper drag of the particles throughout the session into a basin or the river mouth.
- Most fast currents are not usually deep enough to remove the coarse particles.