7th Grade Earth's History Ch4

preserved remains or traces of organisms that lived in the past...

Geologists divide Earth's history into the Geologic Time Scale. T or F?

The time between Precambrian to present....

Layers of rock can be overturned so that younger layers are below older layers. T or F?

Scientists can determine absolute age of rocks using...

In which geologic period did Pangaea form?...

Law of Superposition helps geologists determine..

Generally only the hard parts of organisms become fossils. T or F?

Uranium-40 is useful for dating very old rocks due to its long half-life. T or F?

Footprints and trails are examples of....

2.5 billion years ago, the first organisms used sunlight to release oxygen. T or F?

The climate in the center of Pangaea was probably

type of organism that no longer exists...

You are to take your ch4 study sheet home to put on your nite stand to study all weekend.T or F

Paleontologists have found that older rocks contain fossils of...

Geologists use radioactive dating to...

The geologic time scale is subdivided into...

fossil formed when dissolved minerals replace remains of an organism...

Earth's earliest atmoshere lacked which gas necessary for life?

Time it takes for half of the radioactive atoms in a sample to decay...

Principle that states the processes that change Earth in the past also change Earth today?

The study of fossils has allowed scientists to

A hollow area in sediment in the shape of an organism is called...

A series of dinosaur foot prints in rocks are examples of...

250 million years ago, all continents were joined in one landmass called

Gap in a geologic record where some rock layers have been lost due to erosion..

relative age of rock is...