the shape of the moon when it looks to us like a narrow arc.

serious in appearance, sound, or mood.

to make or repair, or attempt to make or repair, something in an experimental manner

to search or feel about for something in a nervous or clumsy way

the science of the earth's surface and all life on it: the different countries and people of the earth, its climate, its natural resources, and its oceans, rivers, and mountains

the method and process of using whole numbers to add, subtract, multiply, and divide

uneven or unkempt; ragged.

mist, smoke, or dust in the air, making it hard to see

a storm with very strong winds that turn around a center of low pressure in the atmosphere