How can temperature lead to weathering of rocks?
Rocks become ice when they get cold, which can later melt and wash away.
Rocks can melt when they become hot, which can lead to pieces breaking off.
Rocks expand and contract when they are heated and cooled which cause them to break.
Rocks move faster when they are heated, which can cause the pieces to eventually move away.
All of these statements are correct and explain how temperature can lead to weathering of rocks:
1. Thermal stress: When rocks are subjected to repeated cycles of heating and cooling, they expand and contract. This expansion and contraction can create stress on the rock, causing it to crack and break apart.
2. Freeze-thaw weathering: Water can enter cracks and pores within rocks. When this water freezes, it expands and exerts pressure on the surrounding rock. This can cause the rock to fracture and break apart. Upon thawing, the water melts and can wash away the fragmented pieces of the rock.
3. Thermal expansion: Changes in temperature can cause rocks to physically expand or contract. This expansion and contraction can weaken the rock, making it more susceptible to further mechanical weathering processes such as abrasion or erosion.
4. Thermal decomposition: High temperatures can cause certain minerals within rocks to chemically decompose or break down. This can weaken the structure of the rock and make it more prone to disintegration.
In summary, temperature variations play a significant role in the weathering of rocks by inducing stress, creating expansion and contraction, promoting freeze-thaw cycles, and causing thermal decomposition. These processes contribute to the gradual breakdown and erosion of rocks over time.
Sedimentary rocks are formed by cementing.
true
false
True. Sedimentary rocks are formed by the process of cementation, in which sediments (such as sand, mud, or organic matter) are compacted and bound together through various minerals or substances that act as a cementing agent. Over time, as the sediments become lithified, they form solid sedimentary rocks.
How is a valley created by energy flow from Earth's interior?
Solar radiation absorption
Tidal forces from the moon
Convection currents in the mantle are causing the plates to move apart
Atmospheric pressure changes
Convection currents in the mantle are causing the plates to move apart.
Valleys can be created through tectonic processes, specifically through the movement of tectonic plates. The convection currents in the Earth's mantle cause the tectonic plates to move. When plates are moving apart, it can lead to the formation of valleys, such as rift valleys or graben. This process is known as rifting, and it occurs when tensional forces pull the plates apart, creating a linear depression or valley in the Earth's surface.
How can temperature lead to weathering of rocks?
Rocks become ice when they get cold, which can later melt and wash away.
Rocks can melt when they become hot, which can lead to pieces breaking off.
Rocks expand and contract when they are heated and cooled which cause them to break.
Rocks move faster when they are heated, which can cause the pieces to eventually move away.
The three statements that accurately describe how temperature can lead to weathering of rocks are:
1. Rocks expand and contract when they are heated and cooled, causing them to break. Temperature changes can induce thermal stress in rocks, leading to expansion during heating and contraction during cooling. This repeated expansion and contraction can create cracks and fractures within the rock, eventually causing it to break apart.
2. Rocks can melt when they become hot, leading to pieces breaking off. High temperatures can cause certain minerals within the rock to melt or undergo chemical changes, weakening the rock's structure. This can result in pieces breaking off or the rock becoming more susceptible to other forms of weathering.
3. Rocks become ice when they get cold, which can later melt and wash away. Water is a significant agent of weathering. When water enters cracks and pores within rocks and freezes, it expands, exerting pressure on the surrounding rock and potentially causing it to fracture. Upon thawing, the melted water can wash away the fragmented pieces of the rock.
The statement about rocks moving faster when heated, causing the pieces to eventually move away, does not directly relate to temperature-induced weathering. It seems more applicable to the concept of mass movement or erosion, where external forces like gravity or water flow can move rock particles.
so the answer is
The correct answers are:
1. Rocks expand and contract when they are heated and cooled, which causes them to break.
2. Rocks can melt when they become hot, leading to pieces breaking off.
3. Rocks become ice when they get cold, which can later melt and wash away.