10 most difficult Earth riddlesEarth quiz
Which river flows through Zhytomyr?
Zhytomyr is a city in the north of the western half of Ukraine.The Teteriv river generally forms the southern boundary of Zhytomyr, though there are also some small areas of Zhytomyr city territory below the southern bank of the river. Its northern part is contaminated by the Chernobyl power plant.
Who is a LUCA?
a theoretical extraterrestrial being
a the common ancestor of all current life on Earth
a hypothetical organism prehuman
a missing link in Darvin's theory of evolution
The last universal common ancestor (LUCA) is the most recent population of organisms from which all organisms now living on Earth have a common descent. LUCA is not thought to be the first living organism on Earth, but only one of many early organisms, whereas the others became extinct. In 2016 study identified a set of 355 genes inferred to have been present in LUCA. LUCA is estimated to have lived some 3.5 to 3.8 billion years ago in the Paleoarchean era.
How much does planet Earth weigh?
about 6 billion trillion tons
about 6 million trillion tons
about 60 thousand trillion tons
nobody has calculated it exactly yet
Henry Cavendish, british physicist (1731-1810) was the first scientist to calculate mass of the Earth. Greater accuracy has not been achieved for nearly 100 years. He only made a mistake about 1% compared to today's calculations. Cavendish estimated the mass of the Earth to be 6 billion trillion tons. Modern calculations say about 5.9725 billion trillion tons. (5,97219×10^24 kg)
If Earth's radius was larger by 1 meter, how much longer would its equator be?
by approx 6 meters
by approx 6 kilometers
by approx 60 kilometers
by approx 6000 kilometers
For each circle, the length of the circumference is c=2πr. Hence, if a radius grows by 1 meter, the circumference grows by 2 π meters - no matter what the initial value of radius was.
What is the only country to be in all 4 hemispheres?
Fed. States of Micronesia
Kiribati, is an island republic in the Central Pacific. It comprises 33 coral atolls and isles stretching along the equator. It is the only country in all four hemispheres. The country's capital is South Tarawa. It is pronounced "Kiri-bahs"
Who first proposed the need to use summer time?
The idea of daylight saving was first conceived by Benjamin Franklin during his sojourn as an American delegate in Paris in 1784. Sometimes, the creator of this solution is George Vernon Hudson, who wanted to "make better use of the long days of summer. The pioneers in the introduction of summer time were Germans during the First World War.
Where is the saltiest lake in the world?
With a salinity level of over 40%, Don Juan Pond is the saltiest of the Antarctic lakes. This salinity allows the pond to remain liquid even at temperatures as low as −50 °C (−58 °F) due to the interference of salts with the bonding of water molecules. Don Juan Pond was discovered in 1961 by George H. Meyer.
What is the oldest dated mineral on Earth?
Zircons from the Western Australian Jack Hills returned an age of 4.404 billion years, interpreted to be the age of crystallization, making them the oldest minerals so far dated on Earth.
What is the Diameter of Earth?
ca 48 700 km
ca 24 700 km
ca 12 700 km
ca 6 700 km
The latest measurements indicate that the Earth has an equatorial diameter of 12,756 km (7926 mi), and a polar diameter of 12713.6 km (7899.86 mi). In short, objects located along the equator are about 21 km further away from the center of the Earth (geocenter) than objects located at the poles.