An echo is reflected sound. You get echos most often in enclosed spaces with hard walls, like an empty room with wooden floors, or the inside of a large concrete pipe like in the picture. If you make a noise in a place like this, the noise you make sounds like it is being repeated back at you again and again, getting quieter each time.
Mexico is a country south of the United States of America. The capital of Mexico is Mexico City. People in Mexico speak Spanish.
Morocco is a country in north Africa. The capital of Morocco is Rabat, and the largest city is Casablanca. People in Morocco speak Arabic.
Moscow is the capital of the federation of Russia. It has a population of around 11 million.
Nis forNew Mexico
New Mexico, abbreviated to NM, is a state in the south west of the United States of America. The capital of New Mexico is Santa Fe and the largest city in New Mexico is Albuquerque.
Sis forSan Francisco
San Francisco is a city in the state of California in the United States of America. If you include the San Francisco bay area, it has a population of 7.5 million people.