Final challenge: how does the Earth change?

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

   Which word describes the atmosphere?

   liquid · solid · gaseous

   • a) liquid
   • b) solid
   • c) gaseous
   Ver la solución

   Respuesta: c) gaseous

   The atmosphere is made of gases, so it is gaseous. The hydrosphere is liquid and the geosphere is solid.

2. 2 · Rotation or revolution?

   Match the pairs

   Spinning on the axis or travelling around the Sun?

   1. The Earth spins on its axis
   2. The Earth travels around the Sun
   3. Day and night
   4. The four seasons

   • a) 24 hours
   • b) 365 days
   • c) Revolution
   • d) Rotation
   Ver la solución

   Respuesta: The Earth spins on its axis → Rotation · The Earth travels around the Sun → Revolution · Day and night → 24 hours · The four seasons → 365 days

   Rotation: the axis, 24 hours, day and night. Revolution: the orbit, 365 days, the seasons.

3. 3 · Revolution

   How long does the Earth take to travel around the Sun?

   One year.

   • a) 24 hours
   • b) 30 days
   • c) 365 days
   • d) 7 days
   Ver la solución

   Respuesta: c) 365 days

   One revolution takes 365 days (really 365 ¼).

4. 4 · The seasons

   Drag the date when summer begins in Spain

   It is the summer solstice.

   ☀️ Summer begins on ____

   Fichas: 21 March · 21 June · 21 September · 21 December

   Ver la solución

   Respuesta: 21 June

   In the Northern Hemisphere, summer begins on 21 June, the longest day of the year.

5. 5 · The seasons

   Summer begins on 21 December. Which hemisphere is it?

   The seasons are opposite.

   • a) Northern Hemisphere
   • b) Southern Hemisphere
   Ver la solución

   Respuesta: b) Southern Hemisphere

   In the Southern Hemisphere the seasons are the opposite: summer begins on 21 December.

6. 6 · Leap years

   Which day do we add in a leap year?

   It happens every four years.

   • a) 31 December
   • b) 29 February
   • c) 1 January
   • d) 31 June
   Ver la solución

   Respuesta: b) 29 February

   Every four years February has 29 days, so the year has 366 days.

7. 7 · Past simple

   Spring ___ in the Northern Hemisphere on 21 March last year.

   Write the verb begin in the past.

   • a) begins
   • b) began
   • c) beginned
   • d) is beginning
   Ver la solución

   Respuesta: b) began

   Begin is irregular: begin → began.

8. 8 · Past simple

   Russia ___ the first satellite, Sputnik, into space in 1957.

   Regular verb: add -ed.

   • a) launch
   • b) launches
   • c) launched
   • d) launching
   Ver la solución

   Respuesta: c) launched

   Launch is regular: launch → launched.

9. 9 · Volcanoes

   What is the difference between magma and lava?

   Inside or outside?

   • a) Magma is under the ground; lava has come out of the volcano
   • b) Magma is cold and lava is hot
   • c) Lava is under the ground; magma has come out
   • d) There is no difference
   Ver la solución

   Respuesta: a) Magma is under the ground; lava has come out of the volcano

   It is the same hot liquid rock: magma under the ground, lava when it comes out.

10. 10 · Earthquakes

    What causes an earthquake?

    Think about the pieces of the Earth's surface.

    • a) Strong winds
    • b) Too much rain
    • c) Tectonic plates crashing or rubbing against each other
    • d) The Earth's rotation
    Ver la solución

    Respuesta: c) Tectonic plates crashing or rubbing against each other

    Earthquakes happen when tectonic plates crash into or rub against each other.

11. 11 · Natural disasters

    Match each disaster with the sphere where it begins

    Use the study aid if you need help.

    1. Volcanic eruption
    2. Tsunami
    3. Hurricane

    • a) Atmosphere
    • b) Geosphere
    • c) Hydrosphere
    Ver la solución

    Respuesta: Volcanic eruption → Geosphere · Tsunami → Hydrosphere · Hurricane → Atmosphere

    Volcanoes and earthquakes: geosphere. Tsunamis, floods and droughts: hydrosphere. Tornadoes and hurricanes: atmosphere.

12. 12 · Natural disasters

    Which is bigger: a tornado or a hurricane?

    One begins over the sea.

    • a) A tornado
    • b) A hurricane
    • c) They are the same size
    Ver la solución

    Respuesta: b) A hurricane

    Both have swirling winds, but hurricanes are much bigger: some are more than 2,000 km across.

13. 13 · Natural disasters

    How is a drought different from a flood?

    Think about rain.

    • a) A drought is too much rain; a flood is too little
    • b) A drought is very little rain; a flood is too much water
    • c) They are the same
    • d) A drought happens only in the sea
    Ver la solución

    Respuesta: b) A drought is very little rain; a flood is too much water

    A flood is too much water; a drought is very little rain for a long time.

14. 14 · Stay safe

    The ground starts to shake at school. What should you do?

    Earthquake!

    • a) Run near the windows
    • b) Get under a strong table and hold on
    • c) Go up to the roof
    • d) Take a lift
    Ver la solución

    Respuesta: b) Get under a strong table and hold on

    Get under a strong table, hold on and stay away from windows until the shaking stops.