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Earth Composition and Structure

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Questions and Answers

What is the approximate percentage of oxygen in the Earth's composition?

50%

47% (correct)

60%

40%

What is the process used to determine the age of rocks?

Seismic wave analysis

Geologic time scale

Radioactive isotopic decay (correct)

Plate tectonics

What is the approximate radius of the Earth in kilometers?

6,000 km

4,640 km (correct)

3,000 km

4,000 km

What is the process by which the Earth's crust is formed?

Earth formation from superheons (D) Signup and view all the answers

What is the composition of the Earth's inner core?

Liquid iron (A) Signup and view all the answers

How many types of plate boundaries are there?

3 (D) Signup and view all the answers

What type of rocks are formed in high temperature and pressure conditions, resulting in a change from another rock?

Metamorphic rock (B) Signup and view all the answers

What is the process by which different layers of the Earth's crust rise or sink to achieve equilibrium?

Isostasy (B) Signup and view all the answers

What is the term for the erosion of the top of a mountain, resulting in the uplift of the region?

Isostatic uplift (A) Signup and view all the answers

What is the type of plate movement characterized by the pulling apart of the Earth's crust, resulting in the formation of new crust?

Divergent plate movement (A) Signup and view all the answers

What is the term for the density of an object, calculated by dividing its mass by its volume?

Density (C) Signup and view all the answers

What is the type of rock formed through the cooling and solidification of magma or lava?

Igneous rock (A) Signup and view all the answers