Answer:
Magma are the hot molten materials that rises up towards the surface due to the increasing force from the depth. These magma when comes out to the surface then they are considered as lava.
The felsic lava are those in which the amount of silica and aluminium is very high. Due to this high silica content, the viscosity is high. The amount of silica present in magma or lava is directly proportional to the viscosity of magma or lava. The felsic lava due to its high viscosity flows sluggishly.
Whereas, the basic lava are those in which the silica content is significantly less. Iron (Fe) and Magnesium (Mg) is mostly present in this type of lava. As a result of which it flows easily without any difficulty.
This is the reason why felsic magma (lava) are more viscous compared to the mafic magma (lava).
Answer:
The statement that they are characterized by rapids and waterfalls is incorrect about floodplains.
Explanation:
All other points mentioned holds for flood plains:
- Most of the floodplains are low lying areas
- They are generally, the land areas which are adjacent to streams and rivers
- They are subjected to repeated influx or flooding.
- They can be simply characterized by a relatively smooth land area on whose boundary lies water stream or river which overflows or results in flooding at the time when water is high.
Economic opportunities seems to be the driving factor for migration nowadays. An example of a group of migrants migrating from areas with a lack of economic opportunities to areas with more economic opportunities are Mexican immigrants seeking job opportunities.
Answer:
D. The Middle East
Explanation:
some the middle east countries are Saudi Arabia and Iran and they both are in the top 10 list on depending on oil export.
Answer:
The Oceanic plate crust is converging with the continental crust along the west coast
Explanation:
- The example of the ocean and the continent convergence as the crust which is denser gets subducted into the mantel and this occurs along the trenches and is a part of the volcanic coastal mountains like those of the Pacific and the North American plate. Formation of the destructive plate margin as convergence boundary.
