Haku and Chihiro are walking in a canyon where they stop to investigate several rock layers. Haku notices that the bottom layer of rocks have fossils, Chihiro notes a white layer of rock above this with no fossils. They also see the top layer of rock contains different fossils. Explain to Haku and Chihiro what must have happened. Include your claim and at least 1 line of evidence.

The european union was formally established in

At which boundary does subduction stop occurring, resulting in a mountain range?

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