Answer:
Options (A), (B), (C), and (D)
Explanation:
The volcanic activity refers to the eruption of magma at the surface of the ocean floor and continental land areas, forming volcanoes.
Some of the tectonic settings that are associated with volcanic activity are as follows-
- Mantle plumes- These are the large uprising bodies of magma that are generated due to the formation of convection current in the mantle. These are localized body and are located away from the tectonic boundaries. For example, Hawaii is formed as the plates moved over the mantle plumes.
- Continental rifts- This refers to the eruption of magma at the surface of the continents, due to the divergent motion of two continental plates. It results in the formation of a rift, rift valley and then later forms an ocean.
- Island arcs- These are formed due to the collision of two oceanic plates, where the volcanoes are formed on the lighter oceanic plate due to the rising up of magma.
- Continental arcs- These are formed due to the collision between an oceanic and a continental plate, where the volcanoes are formed due to the uprising of magma in the lighter continental plates.
The percentage of the increase of iron is 50% because it increased by 0.6 and that's 50% of 1.2mg
erode means to wear away slowly
Above 500 billion years ago scientific think about Earth
Answer:
Cold and harsh winters exist in this region, which is known for large cities and universities.
Explanation:
The Northeast of the United States is the most developed and most densely populated region of the country. This regions is by far the smallest of the five major regions of the United States. The Northeast region borders Canada on its north, the Atlantic Ocean on its east, the Southeast region on its south, and the Great Lakes area from the Midwest region in its west.
The climate in this part of the country is known for its fresh and pleasant summers. There is solid amount of precipitation throughout the year. The winters tend to be very cold and harsh, with temperatures often going below -30 C degrees, and intense snowfall being a common occurrence.
As mentioned, this region is very densely populated. The main reason for this is that it is the economic center of the United States, so there are large urban areas in it, and the landscape is dominated by settlements. Some of the largest cities in the Northeast are new York, Boston, Philadelphia, and Buffalo.
There are also numerous student towns in the area, mostly on places further away from the large urban areas. Millions of students visit these universities each year, and they are predominantly with very high reputation.
