Answer: A) The 'lub' sound is caused as the atrioventricular valves close.
Explanation:
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Answer:
Option (3)
Explanation:
Springs (hot springs) and geysers are formed when the water from the interior of the earth are ejected into the earth's surface. In simple words, these are formed in the region where the groundwater and the ground surface intersects with each other.
The water obtained from springs can be cold or hot. Those that produce hot water are termed as hot-spring. These hot springs and geysers indicates the occurrence of volcanic activity. This water becomes hot due to the interaction with the magma at certain depths below the ground surface.
The geysers are also a type of hot-springs which produces hot water.
Thus, the correct answer is an option (3).
Doppler effect and redshift as the light coming from stars from the distance can be shifted in the same way as a pitch of sound does
Answer:
The North American Plate
Explanation:
Generally, earthquakes are located at the boundaries between plates where they collide, or grind past each other, or spread apart. New York City lies within the North American plate and the closest plate boundary is thousands of miles away in the middle of the Atlantic.
Answer:
D. the nucleus contains the protons and neutrons which takes up most of the mass of the atom
Explanation:
