Explanation:
Heavy industries refer to industries that involve heavy machinery and large-scale production. They are characterized by the use of large and heavy machines, high capital investment, and a high degree of automation. These industries are generally associated with the production of goods that are used as inputs in other industries.

Examples of heavy industries:
1. Shipbuilding: Shipbuilding is a classic example of a heavy industry. It requires large-scale manufacturing facilities with heavy machinery, cranes, and other equipment to build ships of different sizes and shapes. The process involves the use of heavy metals, welding, and other advanced techniques.

2. Steel production: Steel production is another heavy industry that involves the extraction of iron from iron ore and the use of large furnaces, mills, and other equipment to produce steel. The process is energy-intensive and requires a high degree of automation.

3. Chemicals and petrochemicals: The chemicals and petrochemicals industry involves the production of chemicals and other products from crude oil and natural gas. The process involves the use of large-scale manufacturing facilities, pipelines, and other equipment.

4. Mining: Mining is another heavy industry that involves the extraction of minerals and other resources from the earth. It requires large-scale mining equipment, drilling rigs, and other advanced machinery.

In contrast, industries such as watchmaking, electric bulbs, and knitting needles are considered light industries, which typically involve less capital investment and smaller machinery.