L1 Vocab Exam 1

Question 1

Geology

Answer 1

The study of earth, including our planet’s composition, behavior, and history.

Question 2

nebular theory

Answer 2

The concept that palents grow out of rings of gas, dust and ice surronding a newborn star.

Question 3

nebula

Answer 3

a cloud of gas or dust in space.

Question 4

protoplanetary disk

Answer 4

The plate- shaped region of gas and dust, surrounding the newborn sun from which planets are formed.

Question 5

accretion

Answer 5

The additon of new crust to a planet, by collison of island arcs and oceanic plateaus.

Question 6

planetesimal

Answer 6

Tiny, soild pieces of rock and metal that collect in a plaentary nebula and eventually forms a planet.

Question 7

protoplanet

Answer 7

A body that has grown by the accumulation of planentismals but has not yet become a planet.

Question 8

planet

Answer 8

An object that orbits a star, is roughly spherical and has cleared its neigborhood of other objects.

Question 9

geosphere

Answer 9

any of the almost spherical concentric regions of matter that make up the earth

Question 10

Density

Answer 10

mass per unit volume

Question 11

Buoyancy

Answer 11

The upward force acting on an object immursed or floating in liquid

Question 12

Differentiation

Answer 12

A process early in a planets history during which dense iron alloy melted and sank downward to form the core, leaving the less dense mantle behind.

Question 13

Crust

Answer 13

The rock that makes up the outermost layer of the Earth.

Question 14

Mantle

Answer 14

The thick layer of rock below the Earth’s crust and above the core.

Question 15

Core

Answer 15

The dense, iron-rich center of the Earth.

Question 16

Moho

Answer 16

The boundary between the Earth crust and the mantle.