Unit 2 Lesson 1 Geologic Change over Time

How do organisms become preserved as fossils?

Composition, texture, and features are ways in which to show Earth's history.

Today’s continents were once part of a landmass called _______ .

Scientists drill into icecaps to collect _____, which are long cylinders of ice.

The _____ of an area describes the weather conditions in the area over a long period of time.

The principle of ___ states geologic processes which happened in the past affect the present.

Because low temperatures slow decay, ____ fossils are preserved for thousands of years.

Scientists who studies fossils.

Earth is about 4.6 billion years old.

The gradual movement of the continents across the earth's surface through geological time.

______ is a fossilized structure that formed in sedimentary rock by animal activity.

_____ are the traces or remains of organisms that lived long ago.

Fossils may be skeletons or body parts, shells, burrows, or ancient coral reefs.

Who proposed the theory of continental drift?

What does compaction do for sedimentary rock formation?

Sediment is deposited in layers that can become compacted and cemented together.

Scientists use the thickness of tree rings to learn about the climate during the life of a tree

Composes all the fossils that have been discovered, shows part of the history of life on Earth.

Most geologic change is slow and gradual, but sudden changes have also affected Earth’s history

The distribution of rocks, fossils, and mountains on Earth’s surface is evidence for ____.

Another name for animal dung is ____ .

_____ which is formed when hardened tree sap is buried and preserved in sediment.

Which is NOT considered a trace fossil?

What theories support the idea of continental drift?

Ripples and mud-cracks are which way to show Earth's history.

What is a major process in the formation of clastic sedimentary rock?

The movement of tectonic plates have NOT resulted in extraordinary events such as ___.

Earth’s surface in thick, sticky pools. These pools have trapped and preserved many fossils.

______ happens when an organism’s tissues are replaced by minerals.

Pangaea broke apart about 200 billion years ago.