1. During volcanic eruptions, acid lava cones are formed by highly viscous lavas.
2. Viscous lavas have high mobility and can travel for long distances.
3. Acid lavas result in the formation of high cones with steep slopes.
4. Composite cones are the highest volcanic cones.
Which of the statements given above are correct ?
Volcanic Cone Statements Evaluation
This question asks to identify the correct statements about volcanic cones, focusing on lava properties and cone characteristics.
Evaluating Volcanic Cone Formation Statements
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Statement 1: "During volcanic eruptions, acid lava cones are formed by highly viscous lavas."
Acidic lavas are silica-rich, making them highly viscous. High viscosity means the lava flows slowly and tends to build steep structures. This statement is correct. -
Statement 2: "Viscous lavas have high mobility and can travel for long distances."
Conversely, high viscosity implies low mobility. Thick, slow-moving lavas do not travel far. This statement is incorrect. -
Statement 3: "Acid lavas result in the formation of high cones with steep slopes."
Because highly viscous acid lavas don't flow far, they accumulate near the vent, building up high cones with steep slopes. This statement is correct. -
Statement 4: "Composite cones are the highest volcanic cones."
Composite cones, built from layers of ash and viscous lava, are typically large and steep, often reaching considerable heights. This statement is correct.
Identifying Correct Statements
The analysis confirms that statements 1, 3, and 4 are correct, while statement 2 is incorrect.
Therefore, the correct combination is 1, 3, and 4 only.
Important Questions from Earthquake and Volcano
Consider the following statements with reference to Secondary waves (S-Waves) generated during an earthquake: 1. They create troughs and crests in the material through which they pass. 2. The direction of vibrations of S-waves is perpendicular to the wave direction in the vertical plane. Which of the statements given above is/are correct?
Consider the following statements with reference to Secondary waves (S-Waves) generated during an earthquake:
1. They create troughs and crests in the material through which they pass.
2. The direction of vibrations of S-waves is perpendicular to the wave direction in the vertical plane.
Which of the statements given above is/are correct?
