The Earth's relief and the hydrosphere

How many watersheds are there in Spain?

These are large marine mountain ranges found along the lines of contact between 2 large plates.

The Earth's crust is thinner where it forms the continents and thicker where it is covered by the oceans.

Volcanic eruptions expel gases, ash, rocks and magma.

An area of land lower than the surrounding area.

Watershed is an area of high ground from which water flows down to a river.

Similar to a bay, but bigger.

A large underwater mountain range.

It is the amount of water that a river carries at a specific moment.

When a river slows down, it leaves materials, forming...

The continents used to be one single landmass called Pangea ____ million years ago.

The inner core and the outer core represent ___ of the Earth's volume.

A flat area of the ocean floor, found at depths between 3000 and 7000 metres.

Lack of vegetation can prevent soil erosion on mountainsides.

A flat area of land at an altitude above the sea level.

Thin channel of water that goes inland from the sea.

River flow is the average of the amount of water carried by a river through each month of the year

The outer part of the crust is the lithosphere.

They can extend for many kilometres out to sea with depths up to 400 metres.

A large open area of flat or slightly undulating land.

The crust surrounds the core. It is 1% of the Earth's volume.

A large piece of land surrounded by water on three sides and connected to land by an isthmus.

Continental slope: a steep underwater drop that links the continental shelf with the ocean floor.

The Mariana trench is and example of Abyssal plain.

A mountain range is mainly made up of ...

It can be U-shape or V-shape.

Island: a piece of land almost completely surrounded by water. A group of islands close together from an archipelago.

Volcanic eruptions and earthquakes are caused by external forces.

Part of the land that projects out into the sea.

When an earthquake happens under the sea, it can cause a tsunami.