Answer:
The answer is Option B: plate tectonics.
Explanation:
Plate tectonics is a theory about the structure of the earth's crust. In plate tectonics, the continents are viewed as a part of a system of rigid lithospheric plates which move slowly over the underlying mantle of the Earth. The model for plate tectonics builds on the concept of continental drift, which is an idea developed during the first decades of the 20th century. In continental drift theory, all the world's continents were once joined into a land mass that geologists have called Pangea during the late Paleozoic and early Mesozoic eras. It began to break up about 175 million years ago. In the beginning in the late Triassic, the continents began to break up with Laurasia comprising with what is North America and Eurasia and Gondwanaland which was South America and Africa, India, Arabia, Antarctica, and Australia. The shift in plates and their movement create mountain ranges and continents form and move to different latitudes that change the climate as these land masses moved.
Answer:
A geologic age is a subdivision of geologic time that divides an epoch into smaller parts. A succession of rock strata laid down in a single age on the geologic timescale is a stage .
Explanation:
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The Amazon, Nile and Mississippi rivers have a number of similarities including several large tributaries, a mouth that empties into a major ocean or gulf and incredible size.
Explanation:
A sclereid is a type of sclerenchyma (a plant cell type characterized by having a thick and lignified cell wall) of varying shapes that are typically shorter, with an extremely thick cell wall and <em>whose function is to provide strength and support primarily. Sclereids are also responsible for the gritty texture of pears and guavas. </em>
<em>They are non-living at maturity as they don't require further maintenance, but they maintain the structure.</em>
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The Republic of Panama because Panama connects the continent of North and South America. Also, The Republic of Panama controls the Panama Canal, one of the most important trade routes in the world.
