841. Pollutants that are introduced into the environment by human activity are called anthropogenic pollutants.
842. Isobars are the lines connecting places having the same pressure.
843. The spacecraft that enabled humans to step on the moon first is Apollo XI.
844. X-rays were discovered by Wilhelm Conrad Roentgen.
845. Mercury is the metallic element that is liquid at room temperature.
846. Gamma rays are the most penetrating type of rays.
847. Boiling of an egg is a change that is chemical.
848. Ganymede is the largest moon in our solar system.
849. The most abundant color on Earth is blue.
850. In space, our body loses weight.
851. The freezing point of water is 0 °C.
852. Equator passes through several countries, but the question does not specify which country to consider.
853. The chemical name of dry ice is solid carbon dioxide.
854. The density of milk is 1.034 g/cm3.
855. There is no connection of supernova explosion with quasars.
856. Humans can hear in the range of 20 Hz to 20,000 Hz (20 kHz).
857. The time taken by the Sun to revolve around the center of our galaxy is approximately 250 million years.
858. A frog’s heart has 3 chambers.
859. Rows in the periodic table are called periods.
860. Gravity prevents the Earth’s atmosphere from drifting away into space.