ES Unit 3 Test Review

Front

What geologic feature is composed of the youngest crustal bedrock?

Back

Mid-Atlantic Ridge

Front

What is the approximate velocity in kilometers/second of the P-waves at a depth of 1000 kilometers?

Back

11.5 km/s

Front

What is the depth and density of Earth’s interior at location W, where seismic wave movement is observed?

Back

Depth: 2900 km, Density: from 5.6 g/cm3 to 9.9 g/cm3

Front

What is the distance represented by point A in the diagram?

Back

2 mi

Front

How does the density and composition of oceanic crust compare to continental crust?

Back

Oceanic crust is more dense and less felsic.

Front

What is the primary composition of the continental crust?

Back

Felsic rocks, primarily granite.

Front

What type of rocks primarily make up the oceanic crust?

Back

Mafic rocks, primarily basalt.

Front

What is the significance of the Mid-Atlantic Ridge in plate tectonics?

Back

It is a divergent boundary where new oceanic crust is formed.

Front

What are P-waves and S-waves?

Back

P-waves are primary waves that travel through solids and liquids; S-waves are secondary waves that only travel through solids.

Front

What is the average density of the Earth's crust?

Back

Approximately 2.7 g/cm3.