Based on the label in Figure 3, which explicitly states "Gentle slope of basaltic lava flow," I can identify this as a
shield volcano. Shield volcanoes are known for their broad, gently sloping profiles, which are formed by the accumulation of low-viscosity basaltic lava flows.
Now that I have identified all three volcano types, I will fill in the chart with the appropriate information for each one.
For
Figure 1 (Cinder Cone):
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Form of Volcano: Cinder Cone
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Type of Magma: Typically basaltic or andesitic, which is more viscous than the magma in shield volcanoes, allowing it to trap gases and explode.
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Shape and Height of Volcano: Small, steep-sided cone, usually less than 300 meters tall.
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Type of Eruption: Explosive, due to trapped gases in the magma, producing cinders and ash.
For
Figure 2 (Composite/Stratovolcano):
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Form of Volcano: Composite (or Stratovolcano)
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Type of Magma: Can be basaltic, andesitic, or rhyolitic. The magma is often more viscous, especially in the upper layers.
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Shape and Height of Volcano: Tall, conical mountain with steep sides, built from alternating layers of lava and ash.
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Type of Eruption: Can be both explosive (due to viscous magma) and effusive (lava flows).
For
Figure 3 (Shield Volcano):
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Form of Volcano: Shield Volcano
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Type of Magma: Basaltic, which is low in viscosity and flows easily.
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Shape and Height of Volcano: Broad, gently sloping dome shape, resembling a warrior's shield lying on the ground.
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Type of Eruption: Generally non-explosive, effusive eruptions with fluid lava flows.
Finally, I will answer the question at the bottom of the worksheet: "What are the three types of eruptive products that volcanoes expel?"
Based on the labels in the figures and general geological knowledge, the three main types of eruptive products are:
1.
Lava: Molten rock that flows out of a volcano onto the surface.
2.
Ash: Fine particles of pulverized rock and glass created during explosive eruptions.
3.
Cinders (or Scoria): Small, porous fragments of volcanic rock ejected during an eruption.
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Final Answer:
Here is the completed chart based on the analysis of the figures:
| Form of Volcano | Type of Magma | Shape and Height of Volcano | Type of Eruption |
| :-------------- | :-------------------- | :---------------------------------------------- | :--------------------- |
| 1. Cinder Cone | Basaltic/Andesitic | Small, steep-sided cone (<300m tall) | Explosive |
| 2. Composite | Basaltic/Andesitic/Rhyolitic | Tall, conical, steep-sided mountain | Explosive & Effusive |
| 3. Shield | Basaltic | Broad, gently sloping dome | Non-explosive (Effusive) |
Answer to Question 1:
The three types of eruptive products that volcanoes expel are
Lava,
Ash, and
Cinders (or Scoria).
Parent Tip: Review the logic above to help your child master the concept of free volcano worksheet.
