Based on what you know about speed of light and sound, which come/comes first in a thunderstorm

How does central place theory explain patterns in the size and distribution of cities?

What are canada’s major boundaries?

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