Question

what can you infer about the changes that formed the grand canyon? they were molecular changes. they were chemical changes. they were physical changes. they were changes in weather. 17 multiple choice 1 point how does rust form? through paint flaking off of a metal surface through a chemical reaction between iron and oxygen through weathering through the physical mixing of iron and water

Explanation:

The Grand Canyon was formed mainly through processes like erosion by the Colorado River and tectonic uplift, which are physical changes. Rust forms when iron reacts with oxygen in the presence of water, a chemical reaction.

Answer:

1. C. They were physical changes.
2. B. Through a chemical reaction between iron and oxygen