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Questions and Answers
Which type of volcano is characterized by layers of solid lava flow mixed with other material?
Which type of volcano is characterized by layers of solid lava flow mixed with other material?
- Composite Volcano (correct)
- Hotspot Volcano
- Cinder Cone Volcano
- Shield Volcano
What describes a Cinder Cone Volcano?
What describes a Cinder Cone Volcano?
- It is the largest type of volcano.
- It is built entirely from fluid lava.
- It has a steep conical hill of tephra. (correct)
- It consists of horizontal layers of solid lava.
What is found at the center of a plate where hot material from the mantle rises?
What is found at the center of a plate where hot material from the mantle rises?
- Cinder Cone
- Hotspot (correct)
- Composite Volcano
- Shield Volcano
Which of the following statements is true about oceanic plates?
Which of the following statements is true about oceanic plates?
Which plates are specifically part of the triple junction of tectonic activity?
Which plates are specifically part of the triple junction of tectonic activity?
What is the characteristic thickness range of continental plates?
What is the characteristic thickness range of continental plates?
What does the plate tectonic theory suggest about Earth's lithosphere?
What does the plate tectonic theory suggest about Earth's lithosphere?
Which type of volcano is characterized by layers of solid lava flows and other rock?
Which type of volcano is characterized by layers of solid lava flows and other rock?
What distinguishes oceanic plates from continental plates?
What distinguishes oceanic plates from continental plates?
Which volcanic type resembles a warrior's shield due to its broad, flat shape?
Which volcanic type resembles a warrior's shield due to its broad, flat shape?
What is the primary material that makes up continental plates?
What is the primary material that makes up continental plates?
Which tectonic activity is associated with the Amur Plate?
Which tectonic activity is associated with the Amur Plate?
What are the characteristics of composite volcanoes?
What are the characteristics of composite volcanoes?
Which type of plate is typically thinner and denser?
Which type of plate is typically thinner and denser?
What is the primary composition of continental plates?
What is the primary composition of continental plates?
What occurs at a hotspot?
What occurs at a hotspot?
Which type of volcano is characterized by a broad, shield-like shape?
Which type of volcano is characterized by a broad, shield-like shape?
Which of the following plates is associated with the North American tectonic plate?
Which of the following plates is associated with the North American tectonic plate?
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Study Notes
Volcano Formation
- Earth has 16 major lithospheric plates that move due to convection currents in the mantle.
- Volcanoes are formed primarily at hotspots where hot mantle material rises through a plate.
Types of Volcanoes
- Composite Volcano (Stratovolcano):
- Characterized by a conical shape, formed from alternating layers of solid lava and other volcanic materials.
- Cinder Cone Volcano:
- Steep conical hills made of tephra without horizontal layers; formed around a single vent.
- Shield Volcano:
- Largest type of volcano, built from mostly fluid lava flows that create a broad, shield-like structure.
Oceanic vs. Continental Plates
- Oceanic Plates:
- 6-12 km thick, composed of dense basalt rock.
- Continental Plates:
- 40-60 km thick, made up of lighter granite rocks.
Seafloor Spreading
- New crust formation occurs through seafloor spreading, primarily in underwater settings.
Tectonic Activity
- Triple Junction: Area of significant tectonic activity where different plates interact.
- Amurian Plate: Connected to the Eurasian tectonic plate.
- Okhotsk Plate: Linked to the North American tectonic plate.
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