[Solved] Consider the following activities: Spreading finely ground basalt rock on farmlands Extensively Increasing the alkalinity of oceans by adding lime, Capturing carbon dioxide released by various industries and pumping it into abandoned subterranean mines in the form of carbonated How many of the above activities are often considered and discussed for carbon capture and sequestration?

Q38. Consider the following activities:

1. Spreading finely ground basalt rock on farmlands Extensively
2. Increasing the alkalinity of oceans by adding lime,
3. Capturing carbon dioxide released by various industries and pumping it into abandoned subterranean mines in the form of carbonated

How many of the above activities are often considered and discussed for carbon capture and sequestration?

1. Only One
2. Only Two
3. All Three
4. None

Answer: 3

Spreading finely ground basalt rock on farmlands Extensively

This process is called Enhanced Weathering.
Basalt is rich in calcium and magnesium, which react with atmospheric carbon dioxide (CO₂) to form stable carbonates that remain in the soil or wash into oceans, where they are stored.

Increasing the alkalinity of oceans by adding lime, This is called Ocean Alkalinity Enhancement.

Adding lime (CaO) increases the ocean’s capacity to absorb atmospheric CO₂.

Lime reacts with dissolved CO₂ to form bicarbonates and carbonates, locking CO₂ in the ocean and reducing acidification.

Capturing CO₂ from industries and storing it in subterranean mines. This process is known as Carbon Capture and Storage (CCS).

Captured CO₂ is compressed and injected into geological formations like abandoned oil and gas fields or deep saline aquifers.

Over time, the CO₂ reacts with minerals in the rock and forms stable carbonates.