1, How does sea-floor spreading occur?
A, New materials are being added to the asthenosphere.
B, Earthquakes break apart the ocean floor.
C, Sediments accumulate at the area of spreading.
D, Molten material beneath Earth's crust rises to the surface. ••
2, Which features form the longest mountain range on Earth?
A, The mid-ocean ridges. ••
B, The deep-ocean trenches.
C, The Rockies
D, The Andes.
3, How does sub-duction change the ocean floor?
A, Subduction causes magma to accumulate on the ocean floor.
B, Subduction causes oceanic crust to break into pieces.
C, Subduction causes the ocean floor to sink into deep ocean trenches. ••
D, Subduction causes metamorphic rocks to form.
4, How are ocean trenches formed?
A, Ocean trenches are formed when oceanic plate cools and moves to the surface of the ocean.
B, Ocean trenches are formed when the denser oceanic plate sinks. ••
C, Ocean trenches are formed when molten rock cools and solidifies.
D, Ocean trenches are formed when magma accumulates on the ocean floor.
D
A
C
B
All these are correct ((:
Thank you @helper I got a 100%
D
A
C
D
Hops that helps
Hopes* LOL
hi! to answer the questions, for Science 6 B: Sea-Floor Spreading
Unit 1: Earth's interior systems.
1.
answer: D. Molten material...
2.
answer: A. the mid-ocean ridges
3.
answer: C. Subduction causes the ocean floor...
4.
answer: B. Ocean trenches are formed when denser oceanic plate sinks.
(quick check)
P.S some higher grades such as 7th grade, 8th grade, will have similar tests, or the exact same.
I'm currently giving answers for 6th-grade lessons. But 7th/8th graders might have the same quick check!
-someone from connexus
To answer the questions:
1. How does sea-floor spreading occur?
The correct answer is option D, "Molten material beneath Earth's crust rises to the surface." Sea-floor spreading occurs at the mid-ocean ridges, where molten material called magma rises from the mantle and spreads out, pushing the existing oceanic crust apart.
2. Which features form the longest mountain range on Earth?
The correct answer is option A, "The mid-ocean ridges." Mid-ocean ridges are underwater mountain ranges that run through the middle of the ocean basins and they form the longest mountain range on Earth.
3. How does subduction change the ocean floor?
The correct answer is option C, "Subduction causes the ocean floor to sink into deep ocean trenches." Subduction is the process where one tectonic plate slides beneath another plate. When an oceanic plate subducts beneath a continental plate, it causes the ocean floor to sink into deep ocean trenches, which are some of the deepest parts of the ocean.
4. How are ocean trenches formed?
The correct answer is option B, "Ocean trenches are formed when the denser oceanic plate sinks." When two tectonic plates converge and one plate is denser than the other, the denser oceanic plate sinks beneath the lighter plate. This sinking of the oceanic plate forms ocean trenches, which are long, narrow depressions in the ocean floor.