Answer:
When the sun shines on earth, the sunlight warms up the earth, in the way that sunlight would warm up a greenhouse. At night, when there is no sunlight, the earth cools down, just like a greenhouse. When cooling down, the earth keeps some of the warmth trapped in the atmosphere- just like how a greenhouse would.
The countries in the Horn of Africa are Djibouti, Eritrea, Ethiopia and Somalia. The smallest country in the Horn of Africa is Djibouti, whose capital shares the same name as the country (Djibouti). The Horn of Africa covers the part of Africa that is the most eastern part of the continent and Djibouti lies not far from the Arabian Peninsula, with only a little bit of waterway (the sea) dividing it from Yemen. Djibouti is a multi-ethnic country with Arab and French being the two main languages.
Seismometers are tools which measure motion in the ground including seismic waves generated by earthquakes, volcanoes, and other activities which might create seismic waves. Seismometers measure any movement of seismic activity in the earth and today this is done by electronic means whereby the machine measures any changes in seismic activity in the surrounding areas of the seismometer. The first seismometer is believed to have been invented by Zhang Heng of China's Han Dynasty in 132 AD.
