Out of all the states of matter (gas, liquid, plasma, solid) which one to maintain a definite shape?

The diagram shows the positions of the sun, moon and earth during spring tides, when the high tides are at their highest and low tides at their lowest. what is it about these positions that causes these high and low tides?

What are scientists who study fossils called? ( a ) astronomers. ( b ) biologists. ( c ) geologists. ( d ) paleontologists.

What is the main reason why some developing countries fear the increase the free trade policies around the world?