why do tectonic plates on earth's surface move?(1 point)
A. the pressure from the ground pushes the plates apart.
B. the heat from earth's core moves molten rock beneath the plates.
C. the plates are surrounded by bodies of water that push the plates.
D. iron blocks in earth's core collide and move the plates.
B. the heat from earth's core moves molten rock beneath the plates.
which best describes frost wedge?(1 point)
A. a type of erosion that occurs due to temperature changes
B. a type of physical weathering that occurs due to friction
C. a type of physical weathering that occurs due to temp changes
D. a type of erosion that occurs due to friction
C. a type of physical weathering that occurs due to temperature changes
what is the process of deposition?
Deposition is the process by which sediments, soil, rocks, or other materials are added to a landform or landmass. It occurs when wind, water, ice, or gravity lose their energy and can no longer transport these materials, causing them to settle or accumulate in a new location. Deposition can result in the formation of various landforms such as deltas, sand dunes, alluvial fans, or sedimentary layers.
how does it create land forms?
Deposition of sediments can create various landforms through the accumulation and layering of material over time. Here are a few examples:
1. Deltas: Deposition of sediments by rivers at their mouths can form delta landforms. The sediments carried by rivers settle and accumulate, gradually building up land areas where the river meets an ocean, sea, or lake. Deltas often have a triangular shape, with multiple distributaries branching out.
2. Alluvial Fans: In arid and semi-arid regions, deposition of sediments can create alluvial fans. These landforms are fan-shaped deposits of material that form at the base of mountains or hills. Water flowing down from higher elevations slows down and spreads out, depositing sediment as it loses energy.
3. Sand Dunes: Deposition of wind-blown sand can create sand dune landforms. Wind transports sand grains and when it encounters an obstacle such as vegetation or changes in topography, it loses energy and deposits the sand. Over time, repeated deposition and wind erosion shape the sand into distinctive dune formations.
4. Beaches: Deposition of sediments by ocean waves can form beaches. Waves carry sand and other materials towards the shore and deposit them in a process called beach nourishment. The deposited sediments gradually build up and form sandy land areas along coastlines.
These are just a few examples of how deposition can shape landforms. Deposition can occur in various environments, including rivers, oceans, glaciers, and deserts, and it plays a significant role in shaping the Earth's surface over long periods of time.
about how long does it take for wind to form a sand dune
The time it takes for wind to form a sand dune can vary greatly depending on several factors, including wind strength, sand availability, and local conditions. In some cases, dunes can form relatively quickly, while in others, it may take centuries or even millennia.
In areas with strong and consistent wind, and abundant sources of sand, dunes can form relatively rapidly. This can occur over the course of several years or decades. However, this is not the norm, and the process of dune formation typically takes much longer.
In general, it can take hundreds to thousands of years for wind to shape and form a stable sand dune. This process involves the continual accumulation of sand grains, as well as the selective erosion and deposition of sand by the wind. Over time, as sand is transported and settles, dunes gradually grow and change shape.
The specific duration can vary depending on factors such as the rate of sand supply, the direction and strength of prevailing winds, and the presence of vegetation or other features that influence sand movement. Additionally, dune growth is a dynamic process that continues as long as the necessary conditions persist.