The Earth's rocky outer crust solidified billions of
years ago, soon after the Earth formed. This crust is not a solid
shell; it is broken up into huge, thick plates that drift atop the soft,
underlying mantle.
The plates are made of rock and drift all over the globe; they move both
horizontally (sideways) and vertically (up and down). Over long
periods of time, the plates also change in size as their margins are
added to, crushed together, or pushed back into the Earth's mantle. These plates are from 50 to 250 miles (80 to 400 km) thick.
The correct answer for the question that is being presented above is this one: "2.) Plate tectonics, plate boundaries ." Plate tectonics cause earthquakes and volcanic activity at plate boundaries.
Here are the following choices:
1.) Fault lines, laccoliths
2.) Plate tectonics, plate boundaries
3.) Plate tectonics, the Ring of Fire
4.) Heat from Earth's mantle, fault lines
Answer:
Astronomy is the study of everything in the universe beyond Earth's atmosphere. That includes objects we can see with our naked eyes, like the Sun , the Moon , the planets, and the stars . It also includes objects we can only see with telescopes or other instruments, like faraway galaxies and tiny particles.
Explanation:
