5 Written questions
5 Matching questions
- Mid Atlantic Ridge
- Divergent Boundary
- Outer Core
- Paleozoic Era
- a The era of the Geologic Time Scale when life first appeared in the oceans. It came after Precambrian Time.
- b The next dense layer of the Earth that surrounds the inner core. It's made of a liquid ball of iron.
- c When two plates move away from each other. They cause sea-floor spreading, such as the Mid Atlantic Ridge.
- d A gap in a rock layer. It reduces scientists understanding of Earth's history because it's a missing piece of information.
- e An underwater mountain chain in the Atlantic Ocean caused by sea-floor spreading.
5 Multiple choice questions
- Determining the actual age in years of an object ("Exact").
- The constant rising and cooling of magma in the Earth's mantle. The heat from the inner core is what causes this motion. They cause plate movement in earth's crust.
- When two continental plates move towards each other. They cause mountains.
- When two plates slide past each other. They cause earthquakes.
- When two plates move towards each other, but the dense oceanic crust sinks under the continental crust. They cause volcanoes.
5 True/False questions
Index Fossil → A fossil embedded in a rock layer. The age of the rock layer is the same age as the fossils embedded in it.
Precambrian Time → The section of the Geologic Time Scale that makes up 90% of Earth's History. No life existed at that time.
Crust → The LEAST dense layer of the Earth. It is where life exists and is made up of continental and oceanic crust.
Geologic Time Scale → Changes in earth's land, such as mountains, volcanoes, and earthquakes.
Adaptation → The gradual change in a species over time.