Population: explain the importance of population pyramids and how they help us understand the future of a country. What are the 3 types of population pyramids?

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

How did geography influence the settlement of early africa.

What is the largest river in the united states?