Gravity on the moon is about 1/6 th the gravity felt on the earth. This is because A) the moon is so far away from the earth. B) the moon is much less massive than the earth. C) the earth has a molten core and the moon doesn't. D) the moon is so much further from the sun than the earth.

Answer:

D. Reversal of Earth's magnetic field

Explanation:

The earth's magnetic field changes over time and this causes changes in the direction of magnetization of magnetic elements or minerals in rocks.

Our magnetic field is widely believed to originate from activities within the outer core where molten iron and nickel moves. The flow of these molten elements results in the production of the magnetic signatures on earth surface.

Some elements and minerals within rocks are capable of recording the direction of magnetic fields at a period in time. Before magma cools, such minerals in these rocks aligns their poles to that of the prevailing direction of the earths magnetic field. This is how the magnetic changes at the mid-oceanic ridges are recorded.

Answer:

The process of seafloor spreading is responsible for "creating magnetic changes" along mid-ocean ridges.

Explanation:

• When "seafloor spreading" occurs along the mid-oceanic ridges, it results in a drastic splitting of the oceanic floor over a large area.

• This in return changes the orientation of the predominant magnetic fields and the intensity of their strength in the region.

• The mid-oceanic ridges are majorly constituted of solidified lava which is rich in iron.

• The changes that occur in the local magnetic fields due to seafloor spreading thus create magnetic changes along the mid-oceanic ridges.

Answer:

Correct Answer is A. Where People live and what cultures they create

Explanation:

The term Human systems Briefly summarize one of the main elements in Geographic Studies: The Human Geography. This element in geography studies how humans behave with their environment and with other human beings, how the communities behave, what is their culture, how they have changed the Landscape, what historic processes the community suffered. This element is one of the six subjects of geographic study:

1. The world in spatial terms (lat, long, positioning)

2. Places and Regions ( differences between one space and another)

3. Physical Systems ( Natural changes, Biosphere)

4.Human systems (Human geography)

5. Environment and society (Anthropic effects on the environment)

6. Uses of geography (combining the other elements to understand past, present, and future)