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An example of hard rock is granite, which is commonly used in construction for buildings, monuments, and countertops due to its durability and strength. An example of soft rock is limestone, which is often used in construction for making cement, as a building material, and in the production of lime.

The Theory of Plate Tectonics states that the Earth's lithosphere is divided into several large and small plates that move relative to each other. These plates interact at their boundaries, leading to various geological phenomena such as earthquakes, volcanic activity, and the formation of mountain ranges.

Some economic benefits of rivers and lakes include providing water for irrigation, generating hydroelectric power, supporting transportation and trade, facilitating industrial activities, and enhancing tourism and recreational opportunities. Rivers and lakes also play a crucial role in maintaining ecosystems, biodiversity, and overall environmental health.