The correct option is 1 only
Explanation
Knowledge about the Earth's interior is derived from two types of sources: direct sources (such as surface rocks, mining, and deep drilling projects) and indirect sources (such as seismic waves, gravity anomalies, and magnetic fields). Deep drilling projects are critical for obtaining direct samples of the crustal material.
Statement-wise Analysis:
- Statement 1 is Correct: The Deep Ocean Drilling Project (and its successors like the Ocean Drilling Program) is designed to drill into the ocean floor to retrieve core samples. These projects aim to explore the conditions, composition, and structure of the Earth's crust beneath the oceans.
- Statement 2 is Incorrect: The Integrated Ocean Drilling Project (IODP) is an international marine research collaboration that explores Earth's history and structure recorded in seafloor sediments and rocks. It focuses on the sub-seafloor environment and crustal dynamics, not solely on atmospheric studies.
- Statement 3 is Incorrect: The Kola Superdeep Borehole is located in the Kola Peninsula in Russia (near the Arctic), not in the Indian Ocean. It is the deepest man-made hole on Earth, reaching a depth of over 12 km, and has provided significant data regarding the continental crust.
Key Takeaway:
Deep drilling projects, such as the Integrated Ocean Drilling Project and the Kola Superdeep Borehole, serve as direct sources of information regarding the Earth's interior by providing physical samples of the crust.