What causes the earth’s magnetic field?A.
currents in the earth’s liquid-metal outer core

B.
the mineral composition of the earth’s crust

C.
molten material in the mantle

D.
magnetic particles located at the earth’s poles

Answers

Answer 1
Answer: A. Currents in the earth’s liquid-metal outer core

Hope this helps!
Answer 2
Answer: i think its letter b. the mineral composition of the erath's crust

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You do not know an object's velocity until you know its what?

Answers

The speed of an object in a specific direction is expressed in velocity. you do not know an object's velocity until you know speed and distance.

What is velocity ?

The directional speed of an item in motion, as measured by a specific unit of time and observed from a certain point of reference, is what is referred to as velocity.

The speed of an object in a specific direction is expressed in velocity. Unlike speed, velocity is concerned with the movement's direction.

The difference between velocity and speed is how quickly and in which direction an object moves. Velocity in physics refers to speed in a specific direction. We identify a car's speed when we say it goes at 60 km/h.

Thus, you do not know an object's velocity until you know speed and distance.

To learn more about velocity, follow the link;

brainly.com/question/18084516

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You do not know an object's velocity until you know its speed and direction

the tip of a match contains chemical energy. Kevin's father lit a match and blew out the flame. then he tried to light the same match again . Kevin observed that nothing happened. what can you infer from this observation?

Answers

the chemicals were used so it did not light again

If you went to the moon, how would your mass change relative to your mass on Earth?It would be the same on the moon as on Earth

It would increase because of less gravity

It would decrease because of less gravity

None of the above

Answers

Answer:

Explanation:

you are on the moon or on Earth. Mass is an intrinsic property of matter and is a measure of the amount of matter in an object. It does not depend on the location of the object or the gravitational field it is in. Therefore, your mass would be the same on the moon as it is on Earth.

It would be the same on the moon as on Earth

Which property is a measure of the average kinetic energy of the particles in a sample or matter?(1) mass (2) density (3) pressure (4) temperature

Answers

The temperature of a sample of matter is the macroscopic manifestation 
of the average kinetic energy of its constituent particles.

That's choice-(4) .

What do you make when you hit a rock with a hammer

Answers

You create sound waves and moment from the rock and hammer.

What are the two important jobs of photosynthesis

Answers

1. Photosynthesis is important because oxygen is released as a byproduct. We need that oxygen to survive. 

2. Photosynthesis helps get rid of the carbon dioxide in the air. Carbon dioxide, as you may probably know, is necessary for this process to occur.

It converts solar energy into chemical energy that is stored for later use.

Oxygen is created.