Ch. 8 Astronomy

If no one has ever visited the core of the Earth, how do we know that it is made of metals? a. core material seeps up through volcanoes in the crust b. circulating liquid metals in the core set up a large (measurable) magnetic field c. spectroscopy allows us to tell what the core is made of by analyzing the light we receive d. the amount of radioactivity shows metals must be present; only metals are radioactive e. you can't fool me; there is NO evidence that the Earth's core has metals

b. circulating liquid metals in the core set up a large (measurable) magnetic field

The type of rock we find predominant in the crust of the Earth's continents is called: a. magnetospheric rock b. granite c. lava d. basalt e. metal

b. granite

The Van Allen belt is a. a region of trapped charged particles in the Earth's magnetosphere b. a region where the ultraviolet light from the Sun is blocked from getting further down c. a region where industrial pollution has made a smoggy layer in the atmosphere d. a zone of small orbiting meteorites high above the Earth, which fall down from time to time e. a piece of clothing worn by astronomers after they get their PhD's

a. a region of trapped charged particles in the Earth's magnetosphere

The region around the Earth where charged particles were trapped and spiral around is called: a. the magnetosphere b. the atmosphere c. the ozone layer d. the mantle e. the spirosphere

a. the magnetosphere

Any rock in the Earth's crust that has cooled from an originally molten state is called a. metamorphic b. sedimentary c. igneous d. silicate e. subducted

c. igneous

The largest part of the Earth is its a. oceanic crust b. continental crust c. mantle d. core e. atmosphere

c. mantle

Scientists now understand that the Earth consists of layers with the densest materials in the core. What allowed the differentiation of the Earth's layers to happen? a. a giant rock from space hit the Earth and made a huge hole almost to the center, through which material could move b. continental drift and plate tectonics made this happen c. the early Earth must have been so hot it was like a liquid and heavier things sank to the middle d. this is one of the things that happened in the last few thousand years because of global warming e. this is an unsolved problem; scientists have no good ideas about this at all

c. the early Earth must have been so hot it was like a liquid and heavier things sank to the middle

Which part of the Earth has the greatest density? a. oceanic crust b. continental crust c. mantle d. core e. Bayonne, New Jersey

d. core

An important way that scientists have been able to study the interior of the Earth is by: a. studying the exterior, which is made of exactly the same material b. digging deep trenches at the bottom of the ocean, which is a lot closer to the planet's center c. using spacecraft that can detect strong radio waves coming from the center d. measuring how seismic waves are transmitted through the Earth e. there is no way we can study's the Earth's deep interior at the present time

d. measuring how seismic waves are transmitted through the Earth

Which of the following statements about the Earth's magnetosphere is FALSE? a. it contains particles that come mainly from the solar wind b. it is generated by circulating liquid metal inside the Earth's core c. it was first detected in space by the Explorer 1 satellite d. it extends into space over a region much bigger than the diameter of the Earth e. its shape and size are the same on the sides facing toward and away from the Sun

e. its shape and size are the same on the sides facing toward and away from the Sun