18.) which feature is created on the exterior of a volcano when it erupts and the magma chamber collapses?
19.) in which layer of the earth does the motion of the convection currents drive plate movement?
20.) which two large landmasses formed when pangaea first started to separate?
eurasia & gondwanaland
unit 3: weathering, erosion, & deposition
1.) what process works with erosion to break down rock?
2.) what happens to sediment during deposition?
3.) what role does weathering have in shaping earth’s surface?

Question

Accepted Answer

### Question 18
# Explanation:
## Step1: Recall volcanic features
When a volcano erupts and its magma chamber collapses, a caldera is formed. A caldera is a large, bowl - shaped depression on the exterior of the volcano.
## Step2: Confirm the formation process
The collapse of the magma chamber after an eruption (especially a large - scale eruption) leads to the formation of this large depression. Other volcanic features like craters are usually smaller and formed by different processes (e.g., the vent area or minor collapses), while calderas are specifically associated with magma chamber collapse.
# Answer:
Caldera

### Question 19
# Explanation:
## Step1: Recall Earth's layers and plate tectonics
The Earth's layers include the crust, mantle, outer core, and inner core. Convection currents that drive plate movement are found in the mantle (specifically the asthenosphere, which is a part of the upper mantle).
## Step2: Explain the role of mantle convection
In the mantle, the heat from the Earth's core causes the semi - molten rock to move in convection currents. These currents exert forces on the tectonic plates (which are part of the lithosphere, including the crust and upper mantle) and cause them to move. The outer core is liquid and its movement is related to the Earth's magnetic field, not plate movement. The crust is too rigid and thin to have convection currents that drive plate movement.
# Answer:
Mantle (specifically the asthenosphere in the upper mantle)

### Question 20
# Explanation:
## Step1: Recall Pangaea's breakup
Pangaea was the supercontinent that existed in the past. When it first started to separate, it split into two large landmasses: Laurasia (which included most of the landmasses that are now North America, Europe, and Asia) and Gondwanaland (which included most of the landmasses that are now South America, Africa, Antarctica, Australia, and the Indian subcontinent). The answer provided in the image (Eurasia & Gondwanaland) is incorrect.
## Step2: Correct the identification
Laurasia and Gondwanaland were the two main landmasses formed from the initial breakup of Pangaea. Eurasia is a later - formed landmass from the combination of parts of Laurasia.
# Answer:
Laurasia and Gondwanaland

### Question 1 (Unit 3)
# Explanation:
## Step1: Recall weathering and erosion
Weathering is the process that works with erosion to break down rock. Weathering breaks rock into smaller pieces (either through physical processes like freeze - thaw, or chemical processes like oxidation), and then erosion transports these broken - down pieces.
## Step2: Differentiate from other processes
Deposition is the process of laying down sediment, not breaking down rock. So the process that works with erosion to break down rock is weathering.
# Answer:
Weathering

### Question 2 (Unit 3)
# Explanation:
## Step1: Recall deposition process
During deposition, sediment (which is transported by erosion agents like water, wind, or ice) is laid down or settled out. The sediment can accumulate in layers in areas like river deltas, lake beds, or ocean floors.
## Step2: Explain the mechanism
When the transporting agent (e.g., a river slows down, a wind dies down, or a glacier melts) loses its energy to carry the sediment, the sediment particles are deposited. Heavier particles are deposited first, and lighter particles are deposited later as the energy of the transporting agent decreases.
# Answer:
During deposition, sediment (transported by erosion) is laid down/settled out in a new location, often forming layers.

### Question 3 (Unit 3)
# Explanation:
## Step1: Recall weathering's role
Weathering breaks down rocks into smaller pieces (sediment). This sediment can then be eroded and deposited, which helps in shaping the Earth's surface.
## Step2: Give examples
For example, physical weathering like freeze - thaw can break down mountains into smaller rocks, which are then eroded by water or wind. Chemical weathering like the dissolution of limestone by acid rain can form features like caves. So weathering is the initial step in the process of modifying the Earth's surface by breaking down the original rock material.
# Answer:
Weathering breaks down rocks into smaller pieces (sediment), which is the first step in processes that shape the Earth's surface (e.g., forming new landforms through erosion and deposition of the weathered material, or creating features like caves through chemical weathering).

Sovi.AI - AI Math Tutor

QUESTION IMAGE

Question

Explanation:

Question 18

Step1: Recall volcanic features

Step2: Confirm the formation process

Step1: Recall Earth's layers and plate tectonics

Step2: Explain the role of mantle convection

Step1: Recall Pangaea's breakup

Step2: Correct the identification

Answer:

Question 19