Answer:
b. wind waves, seiches, tsunami, tides.
Explanation:
The wavelength of water waves is calculated measuring the distances between the trough (low point) portion of a wave. Usually, the bigger the wave, the greater the wavelength.
wind waves: small waves caused by the wind. These waves tend to be small and with a short wavelength.
seiches: are usually waves on a lake or other closed water bassin. They can be pretty high from a human perspective, so they are definitely bigger than wind waves.
tsunami: we all know how big the waves of a tsunami can be, totally wiping out coastal cities they encounter, so that's pretty big waves, and big waves tend to be larger apart (so with a bigger wavelength) than smaller ones.
tides: yes, a tide can be considered as a huge wave... that's running throughout the planet. We barely see it as a wave because we can only see one wave at a time, the next wave being tens of thousands of mile away.
Answer:
Movement of people between places on a regular basis → cyclical migration
Study of population → demographics
average number of children a woman will have in her lifetime → fertility rate
the number of people who live in a square mile or kilometer → population density
people who leave their homelands seeking safety in a foreign country → refugees
Explanation:
Migration is the movement of people from from one place to another. A cyclical migration is a kind of movement that is a routine and are usually short.
Demographics is the study of population base on age , race, gender etc.
fertility rate is said to be the measure the number of life birth of a woman in a specific period of time . Fertility rate gives information on how fertile a woman is.
Population density is the number of people per unit area. It gives information on the population per geographical area.
Refugees are individual that have been forced to live their countries to seek refuge in another country as a result of violence or persecution.
He will see blue because the wetsuit is white and the ocean is clear like blue so it’s blue
What you're looking for in here is the hardness: a material can scratch another material if it's harder than it.
So the desired material cannot be harder than amphibole, which has a hardness of 6.
But it has to be harder than fluorite, which has a hardness of 4.
So we're looking for a hardness of between 4 and 6 and from the table we see it's magnesite (we'll need a hard magesite) - this is the correct answer!
