Basalt is not a type of sedimentary rock
Answer:
If the contour lines are close together it means that the change in elevation is very steep.
Explanation:
A is not correct because if the topography is almost flat, the contour lines would be very far apart.
B is correct because the closer the contour lines are, the steeper the topography is, meaning that the terrain is very steep.
C is not correct because if the elevation is not changing, the contour lines will be missing from that part of the map.
Answer: c) The formation of the ice age glaciers occurred about 21,000 years ago.
Explanation:
The last glacial period occurred in the period between 115,000 - 11,700 years in the past with the recent glacial period called Quaternary glaciation. Though some call this period the last ice age, it is a wrong definition because ice age is defined by year-long ice which still persists in the Antarctica and Greenland. The last glaciation that occurred 21,000 years in the past, is the last glaciation on Rocky Mountain.
It occurred in the period 31,000 - 10,000 years and between 23,500 - 21,000, it was at its highest. The glaciation was not made of the giant ice sheet but was made of mountain glaciers known as Cordilleran Ice Sheets. These sheets produced Lake Missoula which late caused Missoula flooding.
Answer:
convergence between a continental plate and an oceanic plate
Explanation:
The Andean Mountain Range has been formed because of volcanic activity. This has happened because of a convergent plate boundary between two plates.
More specifically, the convergent plate boundary is between the continental South American plate and the oceanic Nazca plate. The Nazca plate is lower, denser, heavier, and it is moving below the South American plate, creating a subduction zone.
Where the boundary is between the two plates, the mantle manages to push through magma upwards through the cracks in the crust. This magma managed to get to the surface, lift up the land and create volcanoes, creating a continental volcanic arc parallel to the plate boundary, over time becoming the enormous Andean Mountain Range.
There are some important parameters in such situations that need to be investigated. Things such as the speed of the phenomenon, the risks associated with it and the affected communities/sites are important.
A) The first choice regards the speed of the rising as well as the inherent risk in that, so it is TRUE.
B) The second choice is rather irrelevant to the problem of flooding; the temperature of the water is a parameter that does not affect the flooding, the risk etc. So it is FALSE.
C) Tourism is an important consideration but the first consideration should be the health of people and inquiring about tourism does not help avoid a natural disaster. So it is FALSE.
D) The rate of the rise is important to know for future planning and in order to help with current models. So it is TRUE.
E) The affected towns are an important parameter in minimizing the impact of a natural disaster and hence it is helpful. So it is TRUE.
