Unit 9 - Ch 9 CKLA (8 pts)

What tools did Amy and Matt learn to use at the dig site to excavate fossils?

• A computer
• A rock hammer and chisel
• A telescope
• A microscope

What happens when plaster of Paris is mixed with water?

• It undergoes a chemical change
• It explodes
• It dissolves completely
• It turns invisible

Why are chemical changes considered the ultimate recyclers?

• They use sunlight directly
• They recombine elements in new ways
• They only occur in laboratories
• They create new elements

What is photosynthesis?

• A type of fossil
• A chemical change using sunlight to create sugar and oxygen
• A method to break down plastics
• A process to create water from air

What item did Tess use to explain the concept of how chemical changes are responsible for recycling elements?

• A plastic water bottle
• A leaf
• A piece of coal
• A dinosaur bone

What did Dr. Forrester discover?

• A new species of plant
• A mineral
• A new species of dinosaur
• An ancient tool

What unique feature helped identify the dinosaur bones?

• Color of the bones
• Size of the bones
• Muscle attachment ridges
• Weight of the bones

What does the discovery of a new dinosaur species imply for the students?

• A trip to another dig site
• Their names on a scientific paper
• Extra homework
• A television interview

Why are dinosaur fossils important to scientists?

• They can be sold for a lot of money.

• They help scientists understand what Earth was like in the past.

• They prove that humans and dinosaurs lived at the same time.

• They are used to make jewelry.

When a chemical change occurs...

• carbon dioxide is always released.

• elements rearrange and a new substance is created.

• elements rearrange and the substance stays the same.

• the substance changes its physical form.