They are dynamic, with winds and waves constantly reworking and moving
the barrier island sand.
Changes in sea level also affect these islands.
Most scientists agree that sea level has been gradually rising over the
last thousand years, and this rise could be accelerating today due to global warming.
Rising sea level causes existing islands to migrate shoreward.
The elements is group 18 on the periodic table are called "Nobel Gases".
Jets and planes can fly in the stratophere
Answer:
About 8.3 minutes
Explanation:
Use the formula for velocity as the distance covered by the light divided the time it takes:
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Use the information about the speed of light in vacuum: 
and the information you are given regarding the distance between Sun and Earth: 
to solve the first velocity equation for the unknown time "t":

we can convert second into minutes by dividing by 60: 500 s = 500/60 minutes = 8.3333... minutes
Answer:
The mailbag will take 2.44 seconds to reach the ground.
Explanation:
The height of a helicopter above the ground is given by:

Height of helicopter at t = 2.10 seconds

The helicopter releases a small mailbag from the height of 29.17 m.
The initial velocity of mailbag = u = 0 m/s
Duration in which mailbag will reach the ground = T
Acceleration due to gravity = g = 
Using second equation of motion ;

We have , s = 29.17
u = 0 m/s
t = T

Solving for T, we gte :
T = 2.44 seconds
The mailbag will take 2.44 seconds to reach the ground.