8th Midterm Review

The term petrified means turned into stone.

The oldest fossils of bacteria are 3.5 million years old.

The decay process happens in an exponential, random pattern, not a linear pattern.

Youngest rocks are found along the mid-ocean ridge & became older as you move outward supporting Sea Floor Spreading.

After 42 days, a 2g sample of phosphorus 32 contains only .25g of the isotope. What is the half-life of phosphorus 32?

The blueprint for my bridge must be done before I leave for Christmas so I can start building the day we get back.

If I bury 10g of Curium (half life = 2,345) & leave it for 11,725 years, how much will be left?

Carbon 14 decays into stable _________14.

These fossils help tell the relative ages of rock layers in which they occur.

How many days does it take for 16g of palladium 103 to decay to 1.0g? The half-life of palladium 103 is 17 days.

The term _ comes from the Latin verb fodere which means "to dig".

What might you learn from carbon film but not from a cast?

Radioactive elements occur naturally in sedimentary rock.

So few organisms become fossils because

The more stable the isotope, the slower a sample decays.

What is NOT true about half-life?

Put the following in order by relative age. (first name listed is on the bottom)

In radioactive decay, the atom of one element breaks down and eventually disappears.

This fossil has a hollow area in sediment in the shape of an organism & can later form a cast.

Marie Curie was a French scientist who discovered radioactivity and eventually died from it:-(

Which is not one of the 3 requirements for an organism to become fossil?

Which type of rock and fossil dating uses the decay of radioactive elements to find the age?

The Geologic Time Scale is a chronological representation of Earth's geologic history going back 4.6 ________ years.

What is not true about the law of superposition?

The fossil record provides all of the following evidence except

Fossils and the rock layer they were found in are approximately the same age.

This type of fossil occurs when an organism is trapped quickly in sticky tar, resin, or amber.

This fossil is a solid copy of the shape of an organism.

When a fossil forms, _ slowly hardens into rock and preserves the shape of the organism.

_ is the gradual change in living things over long periods of time.

The hard parts of an organism include