Earth & Astrobiology

Earth's shape is

• oblate spheroid

• sphere

• elliptical

• circle

The two most common elements in the Earth's CRUST are

• aluminum and oxygen

• silicon and oxygen

• carbon and silicon

• iron and oxygen

Tags

NGSS.MS-PS1-1

The density of the Earth is calculated to be about

• 5.5 g/cm3

• 3.5 g/cm3

• 4.5 g/cm3

• 6.5 g/cm3

Scientists use ____ waves to determine the composition of the interior of the planet .

• electromagnetic

• radio

• ultraviolet

• seismic

Tags

NGSS.MS-PS4-2

Type of seismic wave that can travel through solids, liquids and gases.

• s wave

• p wave

• q wave

• r wave

Type of seismic wave that can travel through solids only.

• s wave

• p wave

• q wave

• r wave

Tags

NGSS.HS-PS4-1

thinnest, least dense layer of solid, mostly silicate rocks

• crust

• mantle

• outer core

• inner core

thickest layer, mostly solid but capable of flow when stressed

• crust

• mantle

• outer core

• inner core

liquid layer responsible for the magnetic field

• crust

• mantle

• outer core

• inner core

solid layer due to intense pressure, composed of mostly iron and nickel

• crust

• mantle

• outer core

• inner core