In the past 2000 million years, continents have circled the earth
(a) 40 times
(b) 10 times
(c) 4 times
(d) 2 times

Options

A. 40 times
B. 10 times
C. 4 times
D. 2 times.

Answer

To solve the question regarding how many times the continents have circled the Earth in the past 2000 million years, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding the Question**: The question asks how many times the continents have circled the Earth over a period of 2000 million years.

2. **Analyzing the Options**: The options provided are:
- (a) 40 times
- (b) 10 times
- (c) 4 times
- (d) 2 times

3. **Researching Geological Time**: It is important to understand the geological history of the Earth and the movement of continents. The theory of plate tectonics explains how continents move over geological time.

4. **Evaluating the Time Frame**: Over the last 2000 million years (or 2 billion years), the movement of continents is significant, but it is not as frequent as the higher options suggest.

5. **Conclusion Based on Geological Evidence**: Geological studies and historical data indicate that continents have moved around the Earth approximately 4 times in the last 2000 million years due to the slow but continuous process of plate tectonics.

6. **Selecting the Correct Answer**: Based on the evidence and analysis, the correct answer is (c) 4 times.

### Final Answer:
The continents have circled the Earth approximately **4 times** in the past 2000 million years. Therefore, the correct option is **(c) 4 times**.

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