Unit 2 Earth Science

Front

What is a dependent variable?

Back

A dependent variable is a variable that the scientist observes or measures in an experiment.

Front

How many half-lives has a rock sample with 100 micrograms of uranium-238 gone through if it now contains 6.25 micrograms?

Back

4 half-lives.

Front

Where are the youngest rocks located in the ocean?

Back

The youngest rocks are located at mid-ocean ridges.

Front

What type of evidence do scientists use to locate plate boundaries?

Back

Scientists use seismic activity, volcanic eruptions, and the distribution of earthquakes to locate plate boundaries.

Front

What is an independent variable?

Back

An independent variable is a variable that the scientist changes or controls in an experiment.

Front

Define 'half-life' in the context of radioactive decay.

Back

Half-life is the time required for half of the radioactive atoms in a sample to decay.

Front

What is the significance of mid-ocean ridges in geology?

Back

Mid-ocean ridges are significant because they are the sites of new oceanic crust formation and are associated with volcanic activity.

Front

Explain the relationship between seismic activity and plate tectonics.

Back

Seismic activity is often concentrated along plate boundaries, indicating the movement and interaction of tectonic plates.

Front

What is the role of volcanic eruptions in understanding Earth's geology?

Back

Volcanic eruptions provide insights into the composition of the Earth's interior and the processes occurring at plate boundaries.

Front

How do scientists use fossil records to study plate tectonics?

Back

Fossil records help scientists understand the historical distribution of species and how continents have shifted over time.