Stratigraphy is the study of

Options

A. Earth's crust
B. Sedimentary rocks
C. All types of rocks
D. Underground water.

Answer

### Step-by-Step Text Solution:

1. **Understanding Stratigraphy**: Stratigraphy is a branch of geology that focuses on the layers of rocks or strata in the Earth's crust.

2. **Key Components of Stratigraphy**:
- **Arrangement of Strata**: It examines how these layers are arranged and their succession over time.
- **Origin of Strata**: Stratigraphy also investigates how these layers were formed, including the processes that led to their creation.
- **Composition of Strata**: It looks into the materials that make up these layers, such as minerals and fossils.
- **Distribution of Strata**: Finally, it studies how these layers are distributed across different geographical areas.

3. **Conclusion**: Therefore, stratigraphy is fundamentally the study of the arrangement, origin, composition, and distribution of geological strata in the Earth's crust.