Answer:
B. migratory
Explanation:
Migration is the temporary or permanent displacement of population through geographical space, which since the beginning of humanity has contributed to the survival of human beings. The migrant man does so for some reason, and often the survival of a particular social group depends on their displacement through space, such as during prehistory when the first humans migrated for food.
Answer:
ice age
Explanation:
Definition: a glacial episode during a past geological period
Answer:
Saudi Arabia
Explanation:
Hawaii has volcanoes due to its unique geological setting and the process of plate tectonics. The Hawaiian Islands are part of a volcanic island chain located in the middle of the Pacific Ocean. The primary cause of the volcanoes is the movement of tectonic plates beneath the Earth's surface.
1. Hotspot Theory: The Hawaiian Islands are formed by a hotspot, which is an area of intense heat beneath the Earth's crust. The hotspot remains stationary while the tectonic plates move over it. As a plate moves over the hotspot, the intense heat causes melting of the mantle, creating magma chambers.
2. Formation of a Volcanic Island Chain: As the magma rises through the crust, it eventually reaches the surface through vents and fissures, leading to volcanic eruptions. Over millions of years, as the Pacific Plate moves over the hotspot, a chain of volcanic islands is formed. The oldest islands are located to the northwest, while the youngest islands are to the southeast.
3. Shield Volcanoes: The volcanoes in Hawaii are primarily shield volcanoes, which have a broad, shield-like shape. These volcanoes form from low-viscosity lava (mainly basalt) that flows easily and covers large areas, creating a gradual slope. As the lava cools and solidifies, it builds up the volcano's height and width.
4. Erosion and Subsidence: As new volcanoes are formed, erosion and subsidence processes occur. Erosion from wind, water, and waves wears down the volcanoes, while subsidence causes the older islands to gradually sink back into the ocean. This is why the oldest islands in the Hawaiian chain are smaller and lower in elevation compared to the younger, larger islands.
Overall, the ongoing movement of tectonic plates and the presence of the hotspot beneath the Pacific Plate are the main reasons for Hawaii's volcanic activity and the formation of its iconic volcanic islands.
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