denitrifying bacteria
bacteria that break apart cellulose
nitrogen-fixing bacteria
Answer: nitrogen fixing bacteria
Explanation:
Most plants and animals are dependent on nitrogen fixing bacteria for their nitrogen requirements. As they are incapable of absorbing the atmospheric nitrogen directly. The soil bacteria traps the atmospheric nitrogen convert it into forms like ammonia, nitrates and nitrites which are readily absorbed by the plants and some soil borne animals.
B. For most of its life cycle, star A appeared substantially brighter than star B from earth
C. For most of its life cycle, star B appeared substantially brighter than star A from earth
Only five supernovae have ever been documented as being visible to the unaided eye, with two of those believed to be core-collapse supernovae. Thus, option B is correct.
Iron atoms are compressed so closely together that the nuclei's repelling forces cause the squeezed core to recoil, which causes the star to go supernova and generate a massive, superheated shock wave.
A supernova explosion takes place in a star over the course of just 100 seconds. A star that experiences a supernova explosion dies and leaves behind a neutron star or a black hole as a remnant.
The largest explosion that mankind have yet witnessed is a supernova. Each explosion is the incredibly bright, incredibly potent explosion of a star. The largest explosion that mankind have yet witnessed is a supernova.
Therefore, For most of its life cycle, star A appeared substantially brighter than star B from earth
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A candle placed between two plane mirrors inclined at an angle of 45 degrees will form 7 images. This is due to multiple reflections between the mirrors. The number of images depends on the angle between the mirrors.
In physics, when a candle is placed between two plane mirrors inclined at an angle of 45 degrees, 7 images will be formed. This happens due to multiple reflections between the mirrors. As per the formula for number of images n = 360/θ - 1, where θ is the angle between the mirrors, for an angle of 45 degrees, we get n = 360/45 - 1 = 7. The actual number of images can be less than this if they overlap each other.
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b. plano-concave
c. converging
d. double-concave
b. When magma reaches the surface, its dissolved gas content increases.
c. Melting temperatures of silicate rocks are lowered by small amounts of water.
d. Melting temperatures of silicate rocks increase with increased pressure.
Answer:
When magma reaches the surface, its dissolved gas content increases is true
Explanation:
The volcanic eruptions happen because of magma that is expelled on the earth’s surface. At the earth’s depth, all magma have gas dissolved in liquid. When the pressure has decreased the magma rises towards the earth’s surface creating a separate vapour phase.
As pressure reduces the volume of gas will expands and giving magma its 'explosive character'. Thus, as magma reaches the surface the dissolved gas content decreases and magma comes out of earth’s surface.
The untrue statement is b, as the dissolved gas content in magma decreases as it reaches the surface due to reduced pressure. Basalt magma has higher temperatures than rhyolite magma. Water reduces the melting temperature of silicate rocks, and increased pressure raises it.
The subject here pertains to volcanic activity and magma characteristics. The statement that is not true is: b. When magma reaches the surface, its dissolved gas content increases. In fact, as magma rises to the surface, the pressure decreases which allows the dissolved gases to escape, thus its dissolved gas content actually decreases. Statements a, c and d are true - Basalt magmas do generally have higher temperatures than rhyolite magmas. Additionally, the presence of water does indeed lower the melting temperature of silicate rocks, and increased pressure results in a higher melting temperature for these rocks.
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