Answer:
The Moon, the Sun, and Earth form a straight line during the new Moon and full Moon.
Explanation:
When the earth, moon, and sun line up- which happens at times of full moon or new moon- the lunar and solar tides reinforce each other, leading to more extreme tides, called spring tides.
Answer: Sillimanite, Andalusite, Kyanite and Staurolite
Explanation:
This are the four main minerals that forms in metamorphic rocks and indicates metamorphism.
Sillimanite forms at a high temperature condition, andalusite forms at a moderate temperature and pressure condition, and lastly, kyanite forms at a high pressure condition. Staurolite also forms at high temperature-pressure condition.
This four minerals forms when a rock undergoes metamorphism and are usually found in metamorphic rocks such as schist, gneiss and granulite.
Answer:
Subduction of Pacific plate under North American plate
Explanation:
There has been constant collision between the two plates, namely the Pacific plate and the Central American plate. As a result of which the <u>Pacific plate has got subducted</u> and <u>rate of subduction is very intense and fast</u> here because this lies in the region, commonly known as the "ring of fire".
Due to this subduction, the plates at great depth undergoes dehydration and partial melting occurs, that allows the magma to rise up to the surface forming volcanoes on the central America. There exist a huge number of volcanoes that includes cinder cone, composite as well as shield volcanoes.
Communism, prices determined by the government, restricted freedom of expression, food shortages.
