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earth science unit 5

QuestionAnswer
Continents move slowly across Earth's surface. What theory is this? Continental drift.
Similar fossils on different continents support what theory? Continental drift.
New crust forms where? Mid-ocean ridges.
What moves tectonic plates? Convection currents.
Most earthquakes are caused by what? Movement along faults.
What causes most tsunamis? Underwater earthquakes.
Resistance to flow is called what? Viscosity.
What two metals make up Earth's core? Iron and nickel.
Why doesn't the inner core melt? Extreme pressure keeps it solid.
What is magma? Melted rock beneath Earth's surface.
What is lava? Magma that reaches Earth's surface.
What is a volcano? An opening in Earth's crust where magma, gases, and ash escape.
What causes a volcano to erupt? Pressure builds up from magma and gases beneath Earth's surface.
What type of lava has low viscosity? Basaltic lava.
What is pumice? A light, frothy volcanic rock filled with air pockets.
What is pahoehoe lava? Smooth, ropy basaltic lava.
What is a tectonic plate? A large piece of Earth's lithosphere that moves slowly.
: What is the lithosphere? Earth's crust and the uppermost mantle.
What causes tectonic plates to move? Convection currents in the mantle.
What happens when tectonic plates move apart? New crust forms.
Q: What happens when tectonic plates slide past each other? A: Earthquakes can occur.
Q: What happens when tectonic plates collide? A: Mountains, volcanoes, or trenches may form.
Q: Which is denser: oceanic crust or continental crust? A: Oceanic crust.
Q: What is subduction? A: The process where one tectonic plate sinks under another.
Q: What was Pangaea? A: A supercontinent that contained all Earth's landmasses.
Q: What is the focus of an earthquake? A: The underground location where the earthquake begins.
Q: What is the epicenter? A: The point on Earth's surface directly above the focus of an earthquake.
Q: What are seismic waves? A: Vibrations that travel through Earth during an earthquake.
Q: What is a tsunami? A: A series of large ocean waves caused by underwater disturbances and big displacements of water.
Q: What is seafloor spreading? A: The process where new oceanic crust forms at mid-ocean ridges.
Q: How does seafloor spreading support continental drift? A: It shows that Earth's crust is constantly moving.
Q: What are the four layers of Earth? A: Crust, Mantle, Outer Core, Inner Core.
Created by: user-2044681
 

 



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