What is the definition of a chemical property?

It's a charateristic of a substance that during a reaction of another substance, it performs a charaterisitic.

Example: I'm Lilly, and normally I'm a normal teen. But, when my grandma comes over to visit once a year, I'm even more happier.

So, it's not the best example, but, you get the point. It's a charater when a substance or something different come to that thing, and makes it act different. Hope it helped!

practical process described pest part of scientific investigation.

because practical knowledge is powerful then therotical knowledge.

geosphere and hydrosphere.

this is because the geosphere has to do with geological events, while the hydrosphere controls all water on earth.