Y9 geography about earthquakes , tectonic plates, volcanoes and tsunamis Flashcards
What are tectonic plates?
Large sections of the Earth’s lithosphere that move and interact with each other.
What is the primary cause of earthquakes?
The movement of tectonic plates along fault lines.
True or False: Volcanoes can only form at tectonic plate boundaries.
False
What is the Ring of Fire?
A major area in the basin of the Pacific Ocean where a large number of earthquakes and volcanic eruptions occur.
Fill in the blank: The point on the Earth’s surface directly above the focus of an earthquake is called the ______.
epicenter
What type of plate boundary is characterized by plates moving away from each other?
Divergent boundary
What is a tsunami?
A series of large ocean waves caused by underwater disturbances, such as earthquakes or volcanic eruptions.
Short Answer: Name one method used to measure earthquake magnitude.
Richter scale or Moment magnitude scale.
Which type of volcano is characterized by gentle slopes and non-explosive eruptions?
Shield volcano
True or False: All earthquakes are caused by human activities.
False
What is the focus of an earthquake?
The point within the Earth where the earthquake originates.
What kind of tectonic plate boundary can cause mountains to form?
Convergent boundary
Fill in the blank: Magma that reaches the Earth’s surface is called ______.
lava
What is a fault line?
A fracture in the Earth’s crust along which movement has occurred.
Short Answer: Name a famous volcano in Italy.
Mount Vesuvius.
Which layer of the Earth contains tectonic plates?
The lithosphere.
True or False: Tsunamis can occur in lakes as well as oceans.
False
What is the term for the volcanic material ejected during an eruption?
Tephra
What are the three main types of tectonic plate boundaries?
Divergent, convergent, and transform boundaries.
Fill in the blank: The process by which one tectonic plate moves under another is called ______.
subduction
What is a lahar?
A destructive mudflow on the slopes of a volcano.
Short Answer: What is the term for the intensity of shaking during an earthquake?
Seismic intensity.
True or False: Earthquakes can only happen in certain parts of the world.
False
What is a volcanic island?
An island formed by volcanic activity, often from eruptions under the ocean.