Fossils and Radioactive Dating 4.2

What is a fossil?

• Foot prints, burrows, or other impressions made by animals that give use clues to how they lived.
• When things die and their remains are buried.
• The preserved remains of an organism.
• The age determined by the things around it.

What are trace fossils?

• Foot prints, burrows, or other impressions made by animals that give use clues to how they lived.
• When things die and their remains are buried.
• The preserved remains of an organism.
• The age determined by the things around it.

How do fossils form?

• Foot prints, burrows, or other impressions made by animals that give use clues to how they lived.
• When things die and their remains are buried.
• The preserved remains of an organism.
• The age determined by the things around it.

What is 'half-life'?

• The age determined by the things around it.
• The age of an igneous rock.
• The age determined by radioactive dating.
• The time it takes for 1/2 of the radioactive atoms to decay in an element.

What is radio active decay?

• The preserved remains of an organism.
• Atoms in an unstable element break down to form another element.
• When things die and their remains are buried.
• The time it takes for 1/2 of the radioactive atoms to decay in an element.

What is the relative age of a rock?

• The age determined by the things around it.
• The age of an igneous rock.
• The age determined by radioactive dating.
• The time it takes for 1/2 of the radioactive atoms to decay in an element.

What is the absolute age of a rock?

• The age determined by the things around it.
• The age of an igneous rock.
• The age determined by radioactive dating.
• The time it takes for 1/2 of the radioactive atoms to decay in an element.

What does radio active dating works best to determine?

• The age determined by the things around it.
• The age of an igneous rock.
• The age determined by radioactive dating.
• The time it takes for 1/2 of the radioactive atoms to decay in an element.

What type of fossil is this?

• Mold
• Cast
• Preserved remains
• Trace fossil

What type of fossil is this?

• Mold 
• Cast
• Preserved remains
• Petrified