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Which of the following is NOT a volcanic island? (A) Iceland (B) Reunion Island (C) Maldives (D) Mauritius
Geographically, the Maldives is categorized as a coral archipelago. Unlike Iceland or Reunion Island, which are composed of basaltic volcanic rock, the islands of the Maldives are formed by the growth of coral reefs on the rim of a sunken volcanic chain. As the original volcanoes subsided or sea levRead more
Geographically, the Maldives is categorized as a coral archipelago. Unlike Iceland or Reunion Island, which are composed of basaltic volcanic rock, the islands of the Maldives are formed by the growth of coral reefs on the rim of a sunken volcanic chain. As the original volcanoes subsided or sea levels rose, the coral kept growing upward, eventually forming atolls. Therefore, the visible land surface is purely organic and sedimentary in origin. This makes the Maldives extremely low-lying and geographically distinct from the high, rugged volcanic islands found elsewhere in the Indian and Atlantic Oceans.
See lessA ‘Cinder Cone’ is built primarily from: (A) Fluid lava flows (B) Loose pyroclastic fragments (cinders) (C) Mud and water (D) Solid granite
Cinder cones are the most common type of volcano and are geographically significant for their small size and simple structure. They are built from "tephra"—specifically cinders—ejected during a single eruptive episode. As the molten lava is thrown into the air, it cools rapidly and traps gas bubblesRead more
Cinder cones are the most common type of volcano and are geographically significant for their small size and simple structure. They are built from “tephra”—specifically cinders—ejected during a single eruptive episode. As the molten lava is thrown into the air, it cools rapidly and traps gas bubbles, creating lightweight, reddish or black rocks called scoria. These fall and pile up at the “angle of repose” (about 30-35 degrees), creating the steep slopes characteristic of the cone. They are often found on the flanks of larger volcanoes or as isolated peaks in volcanic fields like Parícutin in Mexico.
See lessThe ‘Eifel’ region in Germany is known for which type of volcanic landform?
The Eifel region represents a unique "maar" volcanic field. A maar is formed when rising magma encounters an aquifer, causing a massive steam explosion that blasts a hole in the Earth's crust without building a mountain cone. The result is a wide, shallow crater surrounded by a low rim of ejected deRead more
The Eifel region represents a unique “maar” volcanic field. A maar is formed when rising magma encounters an aquifer, causing a massive steam explosion that blasts a hole in the Earth’s crust without building a mountain cone. The result is a wide, shallow crater surrounded by a low rim of ejected debris. Geographically, the Eifel is the type-locality for these features. Today, these maars appear as serene, perfectly circular lakes nestled in the landscape. They provide invaluable climate records for geologists, as the sediment layers at the bottom of these lakes have accumulated undisturbed for tens of thousands of years.
See lessWhere is the world’s highest volcanic mountain, Cotopaxi, located?
Cotopaxi is situated about 50 km south of Quito, the capital of Ecuador. It is part of the "Avenue of Volcanoes." Its eruptions often produce massive lahars (mudflows) caused by the melting of its summit glaciers, which pose a severe threat to nearby valleys. Historically, it has erupted more than 5Read more
Cotopaxi is situated about 50 km south of Quito, the capital of Ecuador. It is part of the “Avenue of Volcanoes.” Its eruptions often produce massive lahars (mudflows) caused by the melting of its summit glaciers, which pose a severe threat to nearby valleys. Historically, it has erupted more than 50 times since 1738. While often cited as the “highest active volcano,” that title is technically held by Ojos del Salado on the Chile-Argentina border, but Cotopaxi remains one of the highest and most iconic active cones in the world.
See lessWhat type of volcano is Stromboli? (A) Dormant (B) Active (C) Extinct or dormant (D) None of these
Located in the Tyrrhenian Sea off the coast of Sicily, Stromboli is so consistent in its behavior that geologists named a specific type of eruption after it: "Strombolian eruptions." These involve the bursting of large gas bubbles at the surface of the magma column, throwing incandescent scoria andRead more
Located in the Tyrrhenian Sea off the coast of Sicily, Stromboli is so consistent in its behavior that geologists named a specific type of eruption after it: “Strombolian eruptions.” These involve the bursting of large gas bubbles at the surface of the magma column, throwing incandescent scoria and lava bombs into the air. Despite its frequent activity, it is a popular tourist destination where hikers can observe the “fireworks” from a safe distance. It serves as a natural laboratory for studying basaltic volcanic processes and gas emissions.
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