The Dynamic Earth

Question 1

Convection currents

Answer 1

Keeps the magma moving, the hot less dense magma rises while the cool more dense magma sinks.

Question 2

Converging plates

Answer 2

Plates that collide with the each other.

Question 3

Subduction zones

Answer 3

When one plate is made from oceanic crust and the other is made from continental crust and the oceanic plate sinks underneath the continental as it is heavier.

Question 4

Folding

Answer 4

Layers of rock bend and crumple without breaking.

Question 5

Difference between anticlines and synclines.

Answer 5

Anticlines are folds that bend upwards. Synclines are folds that bend downwards

Question 6

Difference between magma and lava

Answer 6

Magma is molten rock stored in the earths crust while lava is magma that has spilled out onto the the earths surface.

Question 7

Deep ocean trenches

Answer 7

Form along subduction zones.

Question 8

What is some evidence for plate tectonics?

Answer 8

Chains of volcanoes and regions of high seismic activities.
Increasing height of mountain ranges.
The movement of continents.
Rocks further away from mid lines of mid ocean ridges are older than the closer ones.

Question 9

What is a hydrocarbon?

Answer 9

An organic compound made of hydrogen sulfide and carbons.

Question 10

What are some greenhouse gases?

Answer 10

Carbon dioxide, methane and nitrogen oxide.

Question 11

Asthenosphere

Answer 11

Layer of magma that the plates of the lithosphere float on.