What was a major disadvantage of using pure copper for making tools for farming and building?

It was too soft for heavy tasks.

It rusted too quickly in water.

What process did ancient craftspeople use to create the much harder and more useful metal known as bronze?

They hammered copper until it became hard.

They mixed melted copper with tin.

They cooled heated stone in river water.

They added charcoal to melted iron.

Their religious leaders demanded metal objects.

Farming and building required more durable tools.

They had used up all the good quality stone.

Stronger tools were needed for long-distance sea travel.

Finding pure metal nuggets in rivers.

Learning that certain rocks would release metal when heated.

Using powerful stone tools to chip metal out of boulders.

Trading with neighboring communities for metal bars.