The continent was relatively flat before glaciers started carving deep valleys 34 million years ago, a new study finds. Like Alaska's mighty Yukon, a broad river once flowed across Antarctica, following a gentle valley shaped by tectonic forces at a time before the continent became encased in ice.
Answer:
Hardness of a mineral is defined as the resistance to breaking, and density is defined as the mass of a substance per unit volume.
The density and hardness of a mineral, that is formed from through metamorphism are relatively much harder because the metamorphic minerals are formed under extremely high temperature and pressure conditions. These are high-grade minerals.
On the other hand, the density and hardness of a mineral formed through evaporation are much weaker in nature, because these minerals are formed when the water is eliminated due to the high rate of evaporation.
So, it can be concluded that the density and hardness of as mineral formed through the metamorphic process is highly stronger and harder than those that are formed through evaporation.
Answer:
Option (1)
Explanation:
Sediments are defined as broken materials such as rock fragments, soil particles, that are transported from one place to another by the agents such as wind, water and ice. The sediments are formed from the weathering of rock bodies.
The source of a sediment refers to the point (location) from which the sediments are originated.
The fragments of other rocks can be considered to be a source of sediment because these are broken fragments were initially a part of another rock, that eventually weathered, and eroded and deposited at a different place.
hence, the correct answer is option (1).