Answer:
relating to, consisting of, or denoting fragments of rock erupted by a volcano.
Explanation:
Pyroclastic rocks are clastic rocks composed of rock fragments produced and ejected by explosive volcanic eruptions. The individual rock fragments are known as pyroclasts. Pyroclastic rocks are a type of volcaniclastic deposit, which are deposits made predominantly of volcanic particles.
Answer:
A process known as subduction
Explanation:
Answer:
The earthquakes of California are caused by the movement of huge blocks of the earth's crust- the Pacific and North American plates. The Pacific plate is moving northwest, scraping horizontally past North America at a rate of about 50 millimeters (2 inches) per year.
Explanation:
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Answer:
Portugal ⇒ Ruled east of the line of demarcation
After the New World was rediscovered by the European powers and saw competition between the Spanish and the Portuguese, Pope Alexander VI came up with a Line of Demarcation to divide the New World. Portugal was to rule over every land east of the line which is why they colonized Brazil.
Russia ⇒ Controlled what is Alaska today.
Russia controlled what is Alaska today but then decided to sell it to the United States rather than risking the British taking it by forced and adding it to Canada.
Britain ⇒ Controlled the area of today's eastern United States.
Britain ruled the eastern part of today's United States and it was here that they established the colonies that became the first states of the United States of America when these colonies defeated the British in the American Revolution.
Spain ⇒ Ruled west of the land of demarcation
As explained above, Pope Alexander VI came up with a Line of Demarcation. This allowed Spain to rule lands west of this line such that they gained colonies such as Mexico and countries to the west of South America.
answer:
Agriculture is by far the single most important economic activity in Africa. It provides employment for about two-thirds of the continent's working population and for each country contributes an average of 30 to 60 percent of gross domestic product and about 30 percent of the value of exports
