Final answer:
The UK engages in exporting when it sells industrial supplies and materials to other nations. Exporting is the sale of domestically produced goods to foreign countries, which is part of international trade, allowing nations to specialize and expand markets.
Step-by-step explanation:
The UK selling industrial supplies and materials to many nations around the world indicates that the UK engages in exporting. Exporting is the act of selling goods or services produced in one country to another country. Importing, bartering, and outsourcing are different elements of trade. Importing is the purchase of goods or services from another country, bartering is the direct exchange of goods or services without the use of money, and outsourcing is when a company contracts with another company to provide a service that could have been done by its own employees, often to save costs or leverage specialized expertise.
International trade allows nations to expand their markets for both goods and services that otherwise may not have been available domestically. By engaging in international trade, nations can specialize in the production of goods or services that they produce most efficiently, and buy those that they do not produce as efficiently from other countries.