Which of the following statements about the motion of planetary satellites is true? a. planetary satellites can orbit their planet in the same direction as the planet's rotation, or in the opposite direction. b. some planetary satellites have been known to orbit around other satellites. c. planetary satellites never orbit their planet in the opposite direction of their planet's rotation. d. planetary satellites always orbit their planet in the opposite direction of their planet's rotation.

Explanation:

Actually, the direction of the satellite can variate, they can orbit with the same rotation of the planet, and they can orbit in the opposite direction.

However, the majority of satellites orbit in the same direction as their planets.

In addition, remember that a satellite refers to a small body that orbits around a planet, like the Moon, which is Earth's satellite. This small body orbits around a planet due to the force of gravity exerted by the planet, because the more mass, more force of attraction.

answer: the correct answer is 1.

explanation: there are various process in which a radioactive nuclei decays:

1) alpha decay: in this process, a heavier nuclei decays into lighter nuclei by releasing alpha particle. the mass number is reduced by 4 units.

2) electron capture: in this decay process, a parent nuclei absorbs an electron and gets converted into a neutron. simply, a proton and an electron combines together to form a neutron. mass number does not change in this process.

3) gamma ray emission: it is a decay process in which an unstable nuclei gives excess energy by a spontaneous electromagnetic process. this decay releases . this process does not change the mass number.

4) positron emission: it is a type of decay process, in which a proton gets converted to neutron and an electron neutrino. this is also known as -decay. in this the mass number remains same.

from the above information, we see that only alpha-decay is producing a change in the mass number of the nucleus.

answer: the metamorphic rocks are formed when they are exposed to high pressure and high temperatures. this happens when one of the earth's plates comes in contact with the other plate by traveling in opposite directions, straight into each other or slipping under one another. the friction that is caused by this activity results in   melting of rocks and when it cools they are known as metamorphic rocks. this process needs a controlled amount of pressure and temperature otherwise it may turn into magma.