There are (?) many main layers of the earth?
four layers.
The German scientist who developed the theory ... 
Alfred Wegener
What is lava?
Lava is magma that flows out onto Earth's surface
Name one mountain range that you can find in the USA?
The Appalachian Mountains, Rocky Mountains, Sierra Nevada
The Himalayan mountains are the result of a (?) boundary.
convergent
The name of the outermost layer of the earth?
The earth's crust.
The name of the supercontinent...
Pangaea
Name one volcano on Hawaii.
e.g. the Kilauea, Mauna Loa, Mauna Kea,
Where can you find the Mount Kilimanjaro?
Africa, Tanzania
An earthquake.
What are the two types of continental plates / crust?
Oceanic and continental plates / crust.
This plate boundary occurs along the Mid-Oceanic Ridge.
Divergent plate boundary.
What is a shield volcano?
The type of volcano that is formed from layers of lava that slowly flow out of the cone.
What is the name (and height?) of the highest mountain of the world?
Mount Everest, Nepal, 8,848m
The capital of Australia?
Canberra
Where is the hottest temperature and how hot is it?
The (inner) core, up to 5,000°C.
This landform is created when two continental plates collide.
Mountain range.
Name at least one reason why volcanoes can be a curse or a blessing?
blessing: fertile earth, tourists come, you can use the energy from the volcano, ..
curse: it's dangerous!
What is the ocean called that stretches between Australia, Africa and Asia?
The Indian Ocean
What is the name of the big bridge that can be found in San Francisco?

The Golden Gate Bridge
Can you name the layers of the earth?
Crust, mantle, outer core, inner core.
The name of the plate boundary that is responsible for earthquakes.
Transverse boundary.
Why are there volcanoes in Iceland?
The North American and the Eurasian Plate move apart here and a hotspot is there.
Between which four continents is the Pacific ocean located?
North and South America, Asia, Australia
What is the name of the highest mountain in Germany and which mountain range does it belong to?
Zugspitze / Alps