Which region is the source of basaltic magma?

Correct option is D

The correct answer is (d) Upper mantle.
• Basaltic magma primarily originates from the upper mantle, where partial melting of rocks occurs due to pressure and temperature conditions.
Information Booster:

• Basaltic Magma: Rich in iron and magnesium.

• Upper Mantle: o Depth: 10 to 400 km below the surface. 

Composition: Mainly iron and magnesium silicates.

Temperature: Ranges from 500°C to 900°C.

Role: Crucial for plate tectonics and magma formation.

Mnemonic to Remember Layers of the Earth (with Depths): "Crusty People Should Make Fun"

• Crust (0-10 km) • Primary or Mantle (10-400 km)

• Secondary or Outer Core (400-5,150 km)

• Metallic or Inner Core (5,150-6,371 km)
Key Composition Layers:

• SIAL: Silica (Si) and Alumina (Al), forming Earth's crust.
• SIMA: Silica (Si) and Magnesium (Mg), forming Earth's mantle.
• NIFE: Nickel (Ni) and Iron (Fe), forming Earth's core.