5 Written questions
5 Matching questions
- Chemical Weathering
- Geologic Time Scale
- Precambrian Time
- Inner Core
- Cenozoic Era
- a The process by which the chemical make-up of a rock changes.
- b The current era of the Geologic Time Scale. It is when mammals and humans first appeared.
- c The DENSEST layer of the Earth that is made of a solid ball of iron.
- d The section of the Geologic Time Scale that makes up 90% of Earth's History. No life existed at that time.
- e A timeline of earth's history. It correlates the existence of life on Earth with geological events, such as mass extinctions.
5 Multiple choice questions
- A gap in a rock layer. It reduces scientists understanding of Earth's history because it's a missing piece of information.
- The era of the Geologic Time Scale when life first appeared in the oceans. It came after Precambrian Time.
- When two continental plates move towards each other. They cause mountains.
- Long cylinders of ice used to study Earth's atmosphere. Trapped gases and dust inside the ice cores tell scientists when volcanoes erupted and how the climate used to be.
- the process by which rocks break apart without changing the chemical composition.
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.
Relative Dating → Determining the age of an object in relation to other objects ("Estimate").
Mid Atlantic Ridge → An underwater mountain chain in the Atlantic Ocean caused by sea-floor spreading.
Law of Superposition → A law that states in an undisturbed rock layer, the oldest rocks are always on the bottom and the youngest rocks are always on top.
Convection Currents → 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.