because they're different ways
Answer:
Basaltic magma -- SiO2 45-55 wt%, high in Fe, Mg, Ca, low in K, Na
Andesitic magma -- SiO2 55-65 wt%, intermediate. in Fe, Mg, Ca, Na, K
Rhyolitic magma -- SiO2 65-75%, low in Fe, Mg, Ca, high in K, Na
Explanation:
1. Physical weathering
2. Chemical weathering
3. Biological weathering
The area just north of Lake Baikal is called the Irkutsk Oblast, where the city of Irkutsk is located (in Siberia).
