Which of the following statements is true about magnetic fields. magnets and magnetic fields were only just discovered in the last 500 years. the earth’s magnetic field is confined within the core of the earth. the earth’s magnetic field protects the surface from strong electrical currents coming from the sun. magnetic fields are unreliable for use in navigation.

Pushing magma up through the interior of earth

Explanation:

28. evolution

29. environment, survive, offspring  

explanation:

the order for strong to weak forces such as

strong nuclear force → electromegnetic force → weak nuclear force → gravitational force

the fundamental forces are those forces that act between to objects or element to make interactions. there are four types of fundamental forces such as strong and weak nuclear forces (due to protons and electrons), electromagnetic force (due to the motion of electrons) and gravitational force (due to orbital movement of the planet). if these forces are arranged on the basis of their maximum strength then the order is

strong nuclear force → electromegnetic force → weak nuclear force → gravitational force