Earth Layers* FLASHCARD PERIOD 4

Front

What are seismic waves and how do they help us understand the Earth's interior?

Back

Seismic waves are vibrations that travel through the Earth, generated by earthquakes or man-made explosions. They provide information about the Earth's layers by revealing how they reflect and refract.

Front

What is the Earth's inner core?

Back

The inner core is the innermost layer of the Earth, composed mainly of solid iron and nickel, and is extremely hot and dense.

Front

What is the upper mantle?

Back

The upper mantle is the layer of the Earth located just below the crust, consisting of solid rock that can flow slowly over time.

Front

What is the correct order of the Earth's layers from the outside to the inside?

Back

The correct order is: crust, mantle, outer core, inner core.

Front

Which layer of the Earth has the greatest density?

Back

The inner core has the greatest density among all the Earth's layers.

Front

What is the outer core?

Back

The outer core is the layer of the Earth that lies beneath the mantle and surrounds the inner core, composed of liquid iron and nickel.

Front

What is the Earth's crust?

Back

The crust is the outermost layer of the Earth, consisting of solid rock and soil, where we live.

Front

How do scientists study the Earth's layers without direct access?

Back

Scientists study the Earth's layers using seismic waves, which provide indirect evidence about the composition and state of the layers.

Front

What is the mantle?

Back

The mantle is the thick layer of the Earth located between the crust and the outer core, made of semi-solid rock that flows slowly.

Front

What is the asthenosphere?

Back

The asthenosphere is a semi-fluid layer within the upper mantle that allows tectonic plates to move.