Answer: South American plate and African plate
Explanation: Tristan de cunha is a volcano that has formed approximately 150 million years back when the plates namely, the African plate and the South American plate moved in the opposite direction. Due to this diverging plate motion, the Atlantic ocean was formed.
Tristan de cunha is a stratovolcano, having a total height of about 6000 m, of which, about 4000 m lies below the sea level and 2000 m lies above the sea level. It is located at about 500 km towards east of the Mid-Atlantic ridge. The volcano is surrounded by the lava flows and pyroclastic rocks that must have erupted from the volcano in the past.
Environmental factors is not a part of the ICF model. The correct option among all the options that are given in the question is the first option or option "A". The other three options that are given in the question, like participation, activities and persistence are all part of the ICF model. The full form of ICF is International Classification and Functioning.
Earthquakes generate compressional waves (p-waves) and shear waves (s-waves). Compared to the speed of shear waves in a given earth material, the speed of compressional waves is the fastest.
Because of this the compressional waves are the first waves to arrive on a complete record of ground shaking. They are also called P waves, which derives from this fact - P is an abbreviation for primary, first wave to arrive.<span>They typically travel at speeds between ~1 and ~14 km/sec.</span>
Ans: As years passed, more and more evidence was uncovered to support the idea that the plates move constantly over geologic time. It showed that earthquakes, volcanoes, and other active geologic features for the most part aligned along distinct belts around the world, and those belts defined the edges of tectonic plates.
Answer:
Before mountain building occurred, the area was underwater.
Explanation:
Through excavation, fossils that are of marine animals are often found high on mountain ranges. This seems weird from today's perspective, as marine animals can only be found in ocean waters, and there is no way they can travel on land and upon the mountains. Earth has changed a lot throughout history though, so such occurances are actually not that weird.
The mountains in Pennsylvania are such a place, with an abundance of marine fossils. When we look at the geological past of what is now Pennsylvania we can easily see why this is the case. The whole area was actually underwater for millions of years. This was the case before mountain building occurred here when part of the ocean floor raised high above the surface of the water and created land. As the crust was going up, the fossils on it went up as well.
