Economic activity and energy

转盘内容（7 个选项）

• Define the term primary sector and give an example
• Define the term secondary sector and give an example
• Define the term tertiary sector and give an example
• Define the term quaternary sector and give an example
• Describe how the importance of primary industry changes over time and give one reason why
• Explain why the quaternary sector only appears in the post-industrial phase of the Clark-Fisher model
• Expain why the importance of the secondary sector rises and then falls in the industrial phase of the Clark-Fisher model