Earth

Question 1

What are earths layers?

Answer 1

Crust,Mantle,Inner and outer core

Question 2

What are the two types of crust found on earth

Answer 2

ocean and continental crust

Question 3

What is crust composed of?

Answer 3

outer surface of rock. Granite Basalt

Question 4

How thick is earths crust?

Answer 4

3-5 miles, Very thin

Question 5

What are plates

Answer 5

slide over hot and bendable layer of the mantle

Question 6

What is the lithosphere?

Answer 6

crust and upper layer of mantle together make a ridged, ,brittle rock

Question 7

What is a mantle?

Answer 7

Largest layer of rock

Hot dense rock that flows

Question 8

Whats the function of the middle mantle?

Answer 8

The mantle convects heat from the outer core up to the crust

Question 9

Whats the composition of the mantle?

Answer 9

Rocky layer under crust

Question 10

What are convection currents?

Answer 10

caused by the very hot material at the deepest part of the mantle rising, then cooling and sinking again

Question 11

What is outer core and what is it composed of?

Answer 11

Hot ball of metal
metals in liquid state
composed of melted nickle and iron

Question 12

What is the inner core and what is it composed of?

Answer 12

Temps and pressures so great that metals are squeezed together

Question 13

Why can inner core act as a solid?

Answer 13

Metals don’t melt because of high pressure

Forced to viberate like a solid

Question 14

Who proposed the Pangea theory?

Answer 14

Alfred Wegner

Question 15

What are the 4 pieces of evidence that supports the Continental Drift Theory

Answer 15

1. Continents fit together like a puzzle
2. Fossils match across oceans
3. Rock types and mountain ranges match
4. Glacial deposits

Question 16

What is sea floor spreading?

Answer 16

Ocean moves carrying continents
New ocean floor forms along cracks in the ocean
New floor added

Question 17

What are magnetic stripes?

Answer 17

Rocks that make up ocean floor lie in a pattern which hold record of magnetic field

Question 18

3 peices of evidence that support seafloor spreading

Answer 18

Molten material- pillow shaped rocks
shows molten has erupted again and again

Magnetic stripes

Drilling samples

Question 19

What is the plate tectonic theory?

Answer 19

Along the mid-ocean ridge the seafloor is pulling apart and the two parts are moving in opposite directions, carrying along the continents and oceans that rest on top of them.

Question 20

what are 3 types of plate bounderys?

Answer 20

Divergent (pulling away)
Convergent (Crashing head on)
Transform (sliding past eachother)

Question 21

Features of divergent boundaries?

Answer 21

causes rift valleys and mid ocean ridges

Rifting causes sea floor spreading

Question 22

What is subduction zone?

Answer 22

region where tectonic plates meet

Question 23

what happens when Covergent plate boundaries collide:

Answer 23

Ocean to continent: more dense slides under less dense
Ocean to Ocean: older, more dense slides under less dense
Continent to continent: They push together and create mountains

Question 24

What is a transform boundary?

Answer 24

Fault along plate boundary

Question 25

What is a volcano?

Answer 25

object that allows hot lava, volcanic ash, and gases to escape from a magma chamber below the surface

Question 26

What are different types of volcanos?

Answer 26

Cinder cones, Composite volcanos, sheild volcanos

Question 27

What scale is a volcano measured in?

Answer 27

Volcanic Explosivity Index

Question 28

What is an earthquake?

Answer 28

Shake on surface that comes from seismic waves

Question 29

What scale is an earthquake measured in?

Answer 29

Richtor scale

Question 30

What is a tsunami?

Answer 30

tsunami is a series of waves in a water body caused by the displacement of a large volume of water, generally in an ocean or a large lake. Earthquakes, volcanic eruptions and other underwater explosions above or below water all have the potential to generate a tsunami.

Question 31

What are 5 major plates?

Answer 31

Eurasian North and south american African Carabian