Why were European powers dissatisfied with China’s opening of the port of Guangzhou?

Give reason sugarcane waste can be recycled into useful products

Why is the huronian supergroup rock formation particularly interesting to scientists? because it looks like a cross-section of a giant, stone encyclopedia because it formed during the period when oxygen began to accumulate in the atmosphere because it contains unusually large amounts of oxygen and sulfur because it dramatically altered the planet's development when it first formed

The first mathematical theory of tides was introduced by: galileo kepler newton cousteau