Answers Natural Science page 41

8. Complete the sentences

a) To calculate the density of an object we divide its mass by its volumen.
b) Objects that float have a lower density than water.
c) Objects that sink have a higher density than water.

9. Identify the forces.

1. Contact force: buoyancy
2. Contact force: friction
3. Non- contact force: gravity
4. Non- contact force: magnetism

10. Cross out the mistake

b) small: large
c) friction: gravity
d) plastic: metal
e) attract: repel
f) magnetism: friction
g) same: opposite
h) downward: upward

Juegos Etapas de la Historia

http://catedu.es/chuegos/historia/historia.swf

http://www.juntadeandalucia.es/averroes/centros-tic/41009470/helvia/aula/archivos/repositorio/0/201/html/datos/03rdi/ud10/01.htm

http://www.joaquincarrion.com/Recursosdidacticos/QUINTO/datos/02_Cmedio/datos/05rdi/ud14/01.htm

El paleolítico

Don Quijote - Día del libro

http://nea.educastur.princast.es/quixote/index2.htm

http://www.educa.jcyl.es/educacyl/cm/gallery/Recursos%20Infinity/tematicas/webquijote/comic.html

La Prehistoria

La Historia