Answer:
<u>1. c. Peruvian coast, 2. c. Asia, 3. c. Paris, 4. Andes</u>
Explanation:
- Peru is located on the western coast of South America and faces the pacific ocean and located in the southern hemisphere it shares the longest border with brazil. Having a total area of 1,285,215.6 km square.
- Due to the latitude, mountain ranges and topography variations and the two oceanic currents like the Humboldt and El Niño which bring a diverse tropical climate of wt and dry spells to this region thus experiences a drought type conditions of the coasts of Peru.
- Places on earth most likely to encounter the trade winds are in Asia as these winds are moving in an east to west direction following the earth equatorial region, i.e 30 degrees North and South.
- To get the shortest flight from Los Angles to Moscow the plane would have to land in Paris as to refuel and thus making it the shortest flight by less than half-hour.
- Andes mountain runs parallel through the south American north to south borders.
Answer:
Options (1), (2) and (3)
Explanation:
Alfred Wegener was the person who first invented the continental drift theory. He observed that the continents move from one place to another with respect to a fixed point. He put forward many pieces of evidence but he was unable to explain the main mechanism that is responsible for these motion of continents.
The pieces of evidence that were given by Alfred Wegener supporting the continental drift theory are-
(a) The continents move slowly and continuously from one place to another and the edges of these continents perfectly match with the other.
(b) Similar fossil assemblages were found in currently separated continents.
(c) Similar rock types are also found and suggested that the continents were once all together forming a huge landmass which is known as the Pangaea.
Later this theory was modified into a more simple and universally accepted theory which is commonly known as the Plate tectonic theory.
Hence, the correct answers are options (1), (2) and (3).
Answer:
b. medium
Explanation: i took the test and got it right
Answer:
B and C
Explanation:
B. In a given rock sample, the amount of Silicon-32 isotopes gets divided in half about every 170yrs.
This is the concept of half-life. Half life is the time take for half of a radioactive isotope to disintegrate. The shorter the half life the faster the isotope disintegrates.
From the question, we were told that it would take 170yrs for half of the isotope of Silicon to disintegrate to Phosphorus. This is the half life.
C. The half life can be used to determine the amount of Si-32 that has decayed from the time closure temperature was reached.
The closure temperature is very important in radioactivity. It is the temperature at which a system has cooled and there is no resulting disintegration of parent and daughter isotopes.
From first order kinetics, we know that the rate at which radioactive elements decay at any time is directly proportional to the number of radioactive atoms present. A knowledge of the half life helps to figure out the number of atoms that has decayed in time.
