Geosphere Review Flashcard - 7th Grade Science

Front

Which layer of Earth has the highest density?

Back

Inner core: The innermost layer of Earth, composed primarily of iron and nickel, and is solid due to immense pressure.

Front

What characterizes the Precambrian era?

Back

The Precambrian era is characterized by the presence of primitive single-celled organisms, marking the earliest known life on Earth.

Front

What major geological theory is supported by seafloor spreading?

Back

Plate Tectonics: The theory that explains the movement of Earth's lithospheric plates and the formation of geological features.

Front

What does the rock cycle demonstrate about rocks?

Back

Rocks can transform between different types: The rock cycle illustrates how igneous, sedimentary, and metamorphic rocks can change from one form to another.

Front

What does radiometric dating help scientists determine?

Back

Absolute rock age: A method used to date materials by determining the decay of radioactive isotopes.

Front

What is the Earth's crust?

Back

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

Front

What is the mantle?

Back

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

Front

What is the outer core?

Back

The outer core is a liquid layer composed mainly of iron and nickel, located beneath the mantle.

Front

What is the inner core?

Back

The inner core is a solid sphere made primarily of iron and nickel, located at the center of the Earth.

Front

What is continental drift?

Back

Continental drift is the theory that continents have moved over geological time and were once joined together.