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  • How can an eruption change Earth’s surface? (choose more than one)
    The eruption can kill all living things on a volcano.
    It turns the Earth’s surface into flat areas.
    It makes a huge hole on the top of a volcano.
    The lava hardens into a layer of rock...
  • When playing in a stream in Ba Vi National Park, you find beautiful, smooth rocks. How did they get so smooth?
    People painted them to look smooth.
    The wind blew on them for one day.
    They fell from the flatter ground.
    Water carried sediment that rubbed against the rocks over ti
  • Which statement about volcanoes is true?
    The changes caused by a volcano can happen very fast.
    Volcanoes are mainly formed by wind moving sand
    Volcanoes do not change the Earth's surface at all.
    Theys take thousands of years to change the Earth's surface.
  • Some areas in Ho Chi Minh City flood easily during heavy rain because they are built low, similar to New Orleans. If the nearby canals and rivers get too full, what happens?
    The water carves a tall, narrow passage.
    The water moves a sand dune into the city.
    The water turns into tiny pieces of rock.
    The water overflows and can damage buildings and roads.
  • How long does it take for wind to change the shapes of rocks on Earth's surface?
    Very long time
    One month
    One year
    A few days
  • True or False: Wind can wear away rock and change Earth's surface
    True
  • What is sediment?
    Tiny pieces of rock
    Strong winds
    Large pieces of ice
    Deep bodies of water
  • Fill in blank: Weathering occurs slowly but __________.
    surely
  • Fill in blank: Wind and water can __________ rock pieces.
    carry
  • You take a boat ride on the Nho Que River in Ha Giang. You look up and see very tall, narrow rock walls on both sides. What is this landform called?
    A gorge
    A mountain
    A hill
    A beach
  • True or False: The shapes of the rocks can be changed by water in just a few days.
    False
  • In October, a strong storm came to Hanoi. The water in the Hong River rises and flows over its edges into the streets. What is happening?
    The river is flowing uphill.
    The water is emptying into a stream.
    A flood occurs and the water overflows its banks.
    The wind is making a gorge.
  • Why is the city of New Orleans geographically at high risk for flooding?
    It is located right next to a volcano.
    It is built inside a rocky gorge.
    It is built on land that is mostly below sea level.
    It is built on land that is mostly above sea level.
  • Fill in blank: Erosion is very _______________ to humans.
    dangerous
  • True or False: Wind moves a sand dune much more quickly than it can carve rock.
    True
  • Which of the following materials can erupt from a volcano?
    Water and sediment.
    Water and sediment.
    Magma, gases, and ash.
    Only melted rock.
  • True or False: Flood water is safe and cannot damage buildings and roads.
    False
  • Fill in blank: There are three types of weathering: physical, chemical, and _________.
    biological
  • True or False: Grains of sand are huge pieces of rocks.
    False
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