Logging involves cutting down trees in order to use their ______ .
wood
15
What does the secondary sector involve?
Transforming natural resources into finished or semi-finished products
15
In the secondary sector, it is important to ensure _________ development that meets current energy needs, without compromising resources for future generations.
sustainable
15
What are the two types of mining?
underground mines and quarries
15
What are quarries?
an open excavation where we extract plaster, marble, granite, etc.
15
What are some examples of traditional energy sources?
coal, gas, oil and nuclear energy
15
What type of energy sources are limited and non-renewable?
traditional sources
15
What type of energy sources are unlimited and do not pollute?
alternative or renewable sources
15
What do heavy industries do?
transform raw materials into products for other industries