Question

12 multiple choice 5 points
an earthquake occurs when the tectonic plates below earths surface suddenly shift. these shifts of the tectonic plates are caused by
movements in earths core.
movements in earths mantle.
deposition of sediments.
eruption of volcanoes.
13 multiple choice 5 points
which of the following best describes earths tectonic plates?
they move away from each other at the equator.
they move because of convection currents in the mantle.
they collide at midocean ridges.
they form at subduction zones.
14 multiple choice 5 points
how long does earth take to complete one orbit around the sun?
1 day
1 month
1 year
1 decade

Explanation:

• For question 12: Tectonic plate shifts are due to mantle convection currents. Earth's core movements don't directly cause plate shifts. Sediment deposition is a surface - related process (not plate movement cause). Volcano eruptions are a result (not the cause) of plate interactions in some cases.
• For question 13: Tectonic plates move because of convection currents in the mantle. They don't specifically move away at the equator (plate movement is more complex than that). Mid - ocean ridges are where plates move apart (not collide). Subduction zones are where one plate goes under another (not where plates form).
• For question 14: Earth takes 1 year (approximately 365.25 days) to complete one orbit around the Sun. 1 day is Earth's rotation period. 1 month is a lunar or calendar - based period (not orbital). 1 decade is 10 years.

Answer:

1. movements in Earth’s mantle.
2. They move because of convection currents in the mantle.
3. 1 year.