For the first question, I think the correct answer from the list of choices is option B. The composition of the lithosphere are solid iron and nickel. For the second question, the correct answer from the choices listed above is option A. The inner core of the earth solid, while the outer core is liquid because t<span>he pressure is greater in the inner core.</span>
The following are the achievements of the Olmec
civilization:
1.
Water Drainage
-
This civilization was able to construct an
extensive drainage system that is made up of conduits. This was discovered by
the archaeologists in the town of San Lorenzo, the largest city of Olmec
cities. These was carved into a U type shape and covered by capstones. This was
believed to be used as aqueduct to provide water throughout the cities.
2.
Calendar system
-
It was discovered that Olmecs have their own
calendar system. They are using shells to represent numbers in their calendar which
starts with zero. This is one of the first uses of zero as starting point of a
number.
3.
Ulama
-
This is a game of the Olmecs with the objective
of knocking the ball through the hole with the use of hips. The sap of a rubber
tree was utilized to produce balls that was used before.
4.
Writing system
-
They are usually credited as one of those
civilizations to be the first to have their own writing system in America. Their
writing is mostly symbols rather than letter representation.
5.
Compass
-
They are the one to first create compass that
existed in America with the basic understanding of gravity and magnetism.
Answer: b. possible soil creep
Explanation:
Erosion can be defined as the process in which the top layer of the soil is removed because of the action of the agents like wind, water, chemicals, and others. Possible soil creep no agent is mentioned responsible for the soil creep whether it is because of gravity, water, or wind. Evidence of a past debris indicate that the erosion has occurred and displaced the debris from its place. Rapid river can also become an agent in South America. Sand storm will involve the blow of sand with the action of wind in Sahara Desert.
