E&S #41-60

Amber is

• petroleum that oozes from bogs

• hardened tree sap

• yellow rock that retains heat

• dried organic remains

A frozen organism does not decay because

• most bacteria can't survive freezing temperatures

• it is dried out

• it needs water to decay

• most bacteria survive freezing temperatures

A varve is most likely a

• igneous deposit

• fossil plant

• tree ring

• glacial lake

The way fossils are formed in very dry places is called

• mummification

• petrification

• decaying

• sedimentation

What is amber?

• frozen organic matter

• dead bacteria that creates fossils

• tar that fossilizes insects

• tree sap that fossilizes insects

What is coprolite?

• fossilized fish

• fossilized dung or waste

• fossilized rocks

• fossilized carbon films of animals

Using rates of erosion to determine the absolute age of a geologic feature is practical only for features formed within the past

• 2,000,000 years

• 100,000 to 200,000 years

• 10,000 to 20,000 years

• 10,000 years

Why is radioactive delay used to determine the absolute age of rocks?

• Radioactive decay cannot be used to determine the age of a rock.

• Radioactive decay happens very quickly

• Radioactive decay does not happen at a constant rate

• Radioactive decay happens at a relatively constant rate

Carbon films are

• carbonized trace fossils

• carbonized isotopes of organic material

• carbonized impressions of plants or fish

• carbonized bones of animals or fish

One method used to estimate the absolute age of a stream is to

• measure the amount of sediment

• measure the rate at which the stream erodes its bed

• measure the rate at which water flows through the stream during a flood

• count the number of streams that join the stream along its full length