B. igneous
C. chemical
D. metamorphic
Answer:
D. metamorphic
Explanation:
Metamorphic rock is a type of rock derived from the metamorphosis (transformation) of magmatic or sedimentary rocks that undergo modification in their atomic composition, due to the influence of the different conditions of the environment in which they are inserted compared to the places where they were originally formed.
In most cases metamorphic rocks form from other rocks, which are subjected to intense pressures or high temperatures. This process occurs naturally due to the intense and constant movement of the earth's core, causing the periodic movement of the planet's crust (the covering of earth and rocks that make up the planet's outer region). The movement of the crust, in turn, initiates a rearrangement in the rocks located in the upper part, being that when the magmatic and sedimentary rocks are pushed to lower levels, thus giving rise to the process of formation of the metamorphic rock.
Answer:
d. tundra
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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B.oxygen and silicon
C.calcium and sodium
D.potassium and magnesium
Answer: b) election results