they cause the mantle to flow causing plate movement. then when the plates meet earthquakes and volcanoes can occur.
5 of 21
how much does the mid atlantic ridge move per year?
6cm.
6 of 21
what can prove that the the atlantic ocean is getting wider?
telephone cables in the ocean have broken and south america and Africa look like they once fitted together.
7 of 21
what plate is Britain on?
what plate is Britain on?
8 of 21
give some examples of where earthquakes happen.
California and japan
9 of 21
how are volcanoes formed?
1) the plates move towards each other 2) they then rub together 3) the friction melts the rock 4) the molten rock rises 5) volcanoes erupt on the surface
10 of 21
what is it called where plates meet?
a plate boundary.
11 of 21
what is it called when plates move apart?
a constructive boundary
12 of 21
what is it called when plates move together?
a destructive boundary
13 of 21
what is it called when plates slide past each other?
a conservative boundary
14 of 21
give some primary effects of an earthquake.
buildings collapse, debris falls, gas cookers set a light, water and electricity supplies are cut
15 of 21
give some secondary effects of an earthquake.
roads are destroyed meaning emergency services can't get through, tsunamis come crashing, no fresh water causing disease, air rushing into fire causing fire storms
16 of 21
richter scale 1-2
detected by seismometers
17 of 21
richter scale 4
moderate vibration movement of loose objects
18 of 21
richter scale 5
windows shatter objects fall, strong vibrations
19 of 21
richter scale 6
damage to buildings walls crack and chimneys fall
20 of 21
richter scale 7
disaster. ground cracks, pipes break and buildings collapse possible landslides
Comments
No comments have yet been made