Final challenge: how much of the Earth is water?

Las preguntas de esta práctica

Puedes leerlas antes de empezar, hacerlas en un papel o repasarlas después. Cada una tiene su solución explicada.

1. 1 · Review

   Choose the correct body of water

   Aquifers, glaciers, lakes or seas?

   1. Store groundwater
   2. Contain water in a solid state
   3. Are completely surrounded by land
   4. Salt water partly surrounded by land

   • a) Aquifers
   • b) Glaciers
   • c) Lakes
   • d) Seas
   Ver la solución

   Respuesta: Store groundwater → Aquifers · Contain water in a solid state → Glaciers · Are completely surrounded by land → Lakes · Salt water partly surrounded by land → Seas

   Aquifers store groundwater, glaciers are ice, lakes are surrounded by land and seas are partly surrounded by land.

2. 2 · Rivers

   What type of water do rivers contain?

   Salt or fresh?

   • a) Salt water
   • b) Fresh water
   Ver la solución

   Respuesta: b) Fresh water

   Rivers carry fresh water from rain and melted snow.

3. 3 · Rivers

   What is the beginning of a river called?

   It is in the upper course.

   • a) The mouth
   • b) The source
   • c) The meander
   • d) The delta
   Ver la solución

   Respuesta: b) The source

   A river begins at its source and ends at its mouth.

4. 4 · Rivers

   Where does a river flow the fastest?

   Think about a steep slide.

   • a) In the upper course
   • b) In the middle course
   • c) In the lower course
   • d) At the mouth
   Ver la solución

   Respuesta: a) In the upper course

   In the upper course the land is steep, so the water flows quickly.

5. 5 · Rivers

   What happens to the flow of water in the middle course?

   The land is flatter.

   • a) It speeds up
   • b) It slows down and the river gets wider
   • c) It stops
   • d) It goes underground
   Ver la solución

   Respuesta: b) It slows down and the river gets wider

   In the middle course the land is flatter, so the river gets wider and slower, and makes meanders.

6. 6 · Rivers

   Drag the missing course

   Put the stages in order.

   upper course → ____ → lower course

   Fichas: middle course · source course · mouth · glacier

   Ver la solución

   Respuesta: middle course

   Upper course → middle course → lower course.

7. 7 · Rivers

   What is a meander?

   You see it in the middle course.

   • a) A waterfall
   • b) A big curve in a river
   • c) The end of a river
   • d) A lake in the mountains
   Ver la solución

   Respuesta: b) A big curve in a river

   A meander is a curve where the river bends one way and then back again.

8. 8 · River basins

   A river that empties into a bigger river is a…

   Like the Jarama and the Tajo.

   • a) confluence
   • b) tributary
   • c) mouth
   • d) spring
   Ver la solución

   Respuesta: b) tributary

   A tributary empties into a bigger river. The point where they meet is the confluence.

9. 9 · River basins

   Where do two rivers meet?

   Two rivers join together.

   • a) At the source
   • b) At the confluence
   • c) In an aquifer
   • d) In a glacier
   Ver la solución

   Respuesta: b) At the confluence

   The point where two rivers meet is called the confluence.

10. 10 · Spain

    Match each river with its drainage basin

    Where does it flow into?

    1. Ebro
    2. Tajo
    3. Nalón

    • a) Atlantic
    • b) Cantabrian
    • c) Mediterranean
    Ver la solución

    Respuesta: Ebro → Mediterranean · Tajo → Atlantic · Nalón → Cantabrian

    The Ebro flows into the Mediterranean Sea, the Tajo into the Atlantic Ocean and the Nalón into the Cantabrian Sea.

11. 11 · The water cycle

    The Sun heats the sea and water turns into vapour. What is this process?

    The first step of the cycle.

    • a) Condensation
    • b) Evaporation
    • c) Precipitation
    • d) Collection
    Ver la solución

    Respuesta: b) Evaporation

    When the Sun heats the water and it turns into water vapour, it is evaporation.

12. 12 · The water cycle

    Drag the missing process

    Put the water cycle in order.

    evaporation → condensation → ____ → collection

    Fichas: precipitation · evaporation · meander · confluence

    Ver la solución

    Respuesta: precipitation

    Evaporation → condensation → precipitation → collection.

13. 13 · The water cycle

    Water vapour cools down and forms clouds. What is this process?

    Vapour turns into tiny droplets.

    • a) Evaporation
    • b) Condensation
    • c) Collection
    Ver la solución

    Respuesta: b) Condensation

    When water vapour cools and turns into droplets, it is condensation.

14. 14 · Have you ever…?

    "Have you ever ___ a waterfall?"

    Present perfect: have + past participle.

    • a) see
    • b) saw
    • c) seen
    • d) seeing
    Ver la solución

    Respuesta: c) seen

    We say: Have you ever seen a waterfall? (see → saw → seen).