Mega Earth Science Review

Front

What does it mean if dinosaur fossils are found in the bottom rock layers and mammal fossils in the middle layers?

Back

Dinosaurs lived on Earth before the mammals.

Front

What is uniformitarianism?

Back

The processes that shape the Earth continue as they have since the Earth formed.

Front

How do scientists know that some mountains were once at the bottom of an ocean?

Back

Marine fossils have been found on mountain peaks.

Front

What is the most important characteristic of water quality that indicates the health of a water system?

Back

Presence of indicator species.

Front

What is the most accurate method scientists use to predict the age of Earth?

Back

Radioactive dating of rocks.

Front

What is the principle of superposition in geology?

Back

In undisturbed rock layers, the oldest layers are at the bottom and the youngest are at the top.

Front

What are fossils?

Back

Remains or traces of ancient organisms preserved in rock.

Front

What is the rock cycle?

Back

The continuous process of rock formation, breakdown, and reformation.

Front

What is erosion?

Back

The process by which soil and rock are removed from the Earth's surface by natural processes.

Front

What is sedimentary rock?

Back

Rock formed from the accumulation of sediment, often containing fossils.