Questions

Here are the differences between Diamond and Graphite :

From the above analysis, Diamond is harder than Graphite because of the difference of crystalline structures.

There are many isotopes of uranium and all of them have same atomic number i.e, sum of nmber of neutrons and protons.

• Cactus spines are also known as modified bud scales, which are also called modified leaves.

• Cactus spines occur in clusters in the axil of leaves.

1. US Navy commissioned world’s largest aircraft carrier, USS Gerald R Ford into the fleet. The commissioning ceremony was held at Naval Station Norfolk, Virginia in presence of US President Donald Trump.

2. USS Gerald R. Ford is the first ship in this new class of nuclear-powered aircraft carriers for the U.S. Navy. The ship is named after the 38th President of the United States Gerald Ford and has been built by Newport News Ship Building Company. The massive 1,106-foot-long carrier is powered by two new generation nuclear reactors.

The Chinese writers mention India by the name of "Yin-tu".

The oldest generally accepted fossils of large animals range in age from 565 to 550 million years old.

The nearest stars to Earth are in the Alpha Centauri triple-star system, about 4.37 light-years away. One of these stars, Proxima Centauri, is slightly closer, at 4.26 light-years.

Of all the stars closer than 15 light-years, only two are spectral type G, similar to our sun: Alpha Centauri A and Tau Ceti. The majority are M-type red dwarf stars.

Only nine of the stars in this area is bright enough to be seen by the naked human eye from Earth. These brightest stars include Alpha Centauri A and B, Sirius A, Epsilon Eridani, Procyon, 61 Cygni A and B, Epsilon Indi A and Tau Ceti.