Which type of lava is characterized by low silica content?

Which type of lava is characterized by low silica content?

• A. Acidic lava
• B. Basic lava
• C. Rhyolitic lava
• D. Andesitic lava

Answer: (B)

Basic lava is characterized by low silica content, which typically allows it to flow more easily than lavas with higher silica content. This type of lava, often found in basaltic formations, usually has a more fluid consistency and forms less viscous lava flows. The lower viscosity is due to the reduced network of silicate tetrahedra in its composition, promoting a more rapid movement. In contrast, acidic lavas, such as rhyolitic lava, contain higher silica levels, which lead to greater viscosity and more explosive eruptions. Andesitic lava, which sits between basic and acidic lava in terms of silica content, also tends to be more viscous than basic lava. Understanding these characteristics helps in predicting volcanic activity and the type of eruptions associated with different lava compositions.

Basic lava is characterized by low silica content, which typically allows it to flow more easily than lavas with higher silica content. This type of lava, often found in basaltic formations, usually has a more fluid consistency and forms less viscous lava flows. The lower viscosity is due to the reduced network of silicate tetrahedra in its composition, promoting a more rapid movement.

In contrast, acidic lavas, such as rhyolitic lava, contain higher silica levels, which lead to greater viscosity and more explosive eruptions. Andesitic lava, which sits between basic and acidic lava in terms of silica content, also tends to be more viscous than basic lava. Understanding these characteristics helps in predicting volcanic activity and the type of eruptions associated with different lava compositions.