Explain how inertia and gravity combine to keep earth in its orbit.

Gravity and inertia are important for satellites to continue in orbit. Newton's studies led to the conclusion that inertia and gravity keep the Earth orbiting the Sun and in turn, the moon orbits the Earth.

Explanation:

Gravity is the force of attraction that is exerted by one mass on another, in the case of the moon, it is continually attracted to Earth. On the other hand, the force of inertia keeps it moving in a straight line, pushing it into space. It is thanks to the gravity that the moon stays in its orbit, since the straight movement produced by inertia would take it out of its course. Gravity slows and accommodates the moon in relation to the curvature of the Earth.

the best answer is d because the strong cohesion is caused by the ability of water molecules to undergo hydrogen bonding.

a is incorrect because when water solidifies, it becomes   ice, which expands and occupies a bigger volume for the same mass of water in its liquid state.

b is incorrect because water has high surface tension. besides bonding to itself it hydrogen bonds to other molecules at the top decreasing possibility for breaking of attractive forces.

c is incorrect because the water molecule has oxygen which is highly electronegative and so pulls the electron pair towards itself creating a dipole moment, making the molecule polar.

e is incorrect because water has strong adhesion, ability to stick to other molecules such as glass because of this molecules having stronger hydrogen bonding than water.