Answer:
Brittle materials:
Brittle materials are those material which does not shows any indication before failure.It means that they break suddenly without showing any indication.These materials have zero ductility.
Ex :
1.Glass is the very common example for brittle material and in our house we can easily see that when ever glass fall on the floor it breaks in very small pieces.
2. Metal objects are made from metal they behave as brittle like cast iron.
3. The another familiar example in our house for brittle material is dry clay.
Ductile materials:
Ductile materials which shows a indication before fracture.It have a range ,within this range they did not fail.The ability of material to draw into wires is known as ductility of that materials.
Ex :Those object are made from carbon steel,gold,silver etc.
Elastic deformation :
To regain the original shape after removal of load is known as elastic deformation.
Ex: The familiar example of elastic deformation is rubber band ,when we apply a force on the rubber band then it goes under the deformation but after removal the load come back on the original position.
Answer:
When the velocity of wind or water slows, eroded sediment is deposited in a new location. The sediment builds up in a process called sedimentation and creates fertile land. River deltas are made almost entirely of sediment that has eroded from the banks and bed of a river.
There are many landscape features specifically associated with rivers: V shaped Valleys - particularly in their upper parts, rivers often form V-shaped valleys whereas glaciers commonly form U-shaped valleys. The V-shaped valley is created by erosion. Meanders - the curves or bends of a river.
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Answer:
a. as an icon is representing something
Middle America is an isthmus that connects North and South America.
Explanation:
Middle America, or more commonly referred to as Central America, is actually part of North America. It represents the southernmost part of the continent, but is often put as a separate region because of its shape which makes it distinct from the rest of the continent. In fact, it can be said that Middle America is an isthmus that is connecting the two large continental masses of North America and South America.
This region's northern boundary is still disputable, and it varies from author to author, though in general it is borders of Belize and Guatemala that are taken as the northernmost parts. On the south it is Colombia's border, on the east it is the Caribbean Sea, while on the west is the Pacific Ocean. As a region, because of the multiple tectonic plate boundaries, Middle America is geologically highly active, with volcanic and earthquake activities being relatively common.
The countries that comprise this region are:
- Guatemala
- Belize
- El Salvador
- Nicaragua
- Honduras
- Costa Rica
- Panama
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