What does the word monsoon mean

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

Irelanda. populationb. square mileagec. average population density per square mile

Which phrases apply to metamorphic rocks? check all that apply. form under extreme heat and pressure form from existing rocks form from magma and lava form when sediments combine form from volcanic eruptions