Final answer:
The shape of a rock can be altered by erosion and weathering, chemical reactions, tectonic activity, and biological processes.
Step-by-step explanation:
Based on the given information, the shape of a rock can be altered through different processes. One way is through erosion and weathering. This occurs when rocks are broken down into smaller pieces by physical and chemical processes such as wind, water, and ice. Another way is through biological processes. For example, plant roots can crack rocks as they grow.
Chemical reactions and tectonic activity can also alter the shape of rocks. Chemical reactions can dissolve certain minerals in rocks, weakening their structure. Tectonic activity such as folding and faulting can deform rocks, changing their shape.
Overall, the shape of a rock can be altered through erosion and weathering, chemical reactions, tectonic activity, and biological processes.