The name Galapagos islands has been given on the basis of occurrence of

Options

A. Black cooled lava
B. Giant Tortoises
C. Giant igunnas
D. All the above

Answer

To answer the question regarding the origin of the name "Galapagos Islands," we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Location**: The Galapagos Islands are located in the Eastern Pacific Ocean, approximately 973 km off the west coast of South America.

2. **Historical Context**: The islands were discovered in 1535 by a Spaniard named Fray Tomás de Berlanga.

3. **Reason for Naming**: Upon discovering the islands, Fray Tomás de Berlanga observed the unique wildlife present there, particularly a species of giant tortoise.

4. **Conclusion**: The name "Galapagos" is derived from the Spanish word "galápago," which means tortoise. Therefore, the islands were named based on the occurrence of the giant tortoises found on them.

5. **Final Answer**: The correct answer to the question is that the name Galapagos Islands has been given on the basis of the occurrence of the giant tortoise.