<span>Nuclear fission produces elements that are heavier than helium.
The elements that are used in nuclear fission and their products are much heavier than helium.</span>
Answer:
a. Temperatures increase can change a solid to a liquid, but cannot change a liquid to a solid
b. The particles in a solid are much closer together than the particles in a liquid.
Explanation:
Any material expands when heated and contracts when cooled. So, when a body is heated to a particular temperature, it starts melting and changes into a liquid.
As the material expands the distance between the atoms or molecules increases and it will become a liquid. So it can move around the material. It doesn't become solid on further heating. But water is an exception where it contracts when heated from 0° to 4° C.
In solids, these atoms or molecules are closely packed. It is rigidly fixed.
The solid, as well as the liquid, has a definite volume, but the liquid does not have a definite shape.
D. Because the moons shadow during a total lunar eclipse is tinnier than the earth.
This statement would be FALSE.
Foresters engage in timber harvesting, ecological restoration and management of protected areas. They <span>survey and assess the health and status of public and privately owned woodlands, and develop conservation and management strategies. They protect wildlife habitats and address problems such as soil erosion, invasive species and pests that undermine tree health.</span>
They all travel by the same speed and light
