To determine which statement is not correct, let's analyze each of the provided statements one by one.
1. **Statement 1:** "Solids, liquids, and gases are present around us."
- This statement is correct. In our environment, we encounter all three states of matter: solids (like rocks, metals), liquids (like water, oil), and gases (like air, carbon dioxide).
2. **Statement 2:** "We use solids more often than liquids and gases for various applications."
- This statement is also correct. Solids are commonly used in construction, manufacturing, and various other applications due to their structural integrity.
3. **Statement 3:** "We need solids with widely different properties."
- This statement is correct as well. Different applications require solids with varying properties, such as hardness, melting point, conductivity, etc.
4. **Statement 4:** "The study of solid structure is not important."
- This statement is **not correct**. The study of solid structure is crucial in materials science, chemistry, and engineering as it helps us understand the properties and behaviors of materials.
Based on the analysis, the statement that is not correct is:
**"The study of solid structure is not important."**
### Step-by-Step Solution:
1. **Identify the statements given in the question.**
- List out the statements related to solids, liquids, gases, and the importance of studying solid structures.
2. **Evaluate each statement for correctness.**
- Analyze each statement to see if they are true or false based on scientific understanding.
3. **Determine which statement is incorrect.**
- After evaluating, identify which statement does not hold true.
4. **Conclude with the incorrect statement.**
- Clearly state the incorrect statement as the answer.
