GRADE 9 SCIENCE I GRADE 9 SCIENCE 1 1 OF 24 A scientist proposed the theory of continental drift, which claims that Earth's continents were once joined
together as one large continent and drifted apart, creating the separate continents we know today,
Examine the map shown in Figure 1.
AFRICA
Fossils of
the land
reptile
Lystrosaurus
INDIA
AUSTRALIA
SOUTH
AMERICA
ANTARCTICA
Fossils of the
Fossils of the
land mammal
Fossils of the
land plant
Cachiyacuy
freshwater reptile
Glossopteris
Mesosaurus
Source: The Geological Society of London
Figure 1. Index Fossils of the Southern Hemisphere
Identify whether the man does or does not support the scientistisclaim and choose two pieces of

A23 kg log of wood begins from rest, 300 m up a sluice (a water track used to transport logs, think of it as an inclined plane with negligible friction) inclined at 20° to the horizontal. after it reaches the flat waterway at the bottom it collides elastically with a 100 kg block of wood initially at rest near the base of the incline. (a) how long does it take the 23 kg log to travel down the incline? (b) what is the speed of the 23 kg log at the bottom of the incline? (c) what are the velocities of both blocks of wood after the collision? (d) what is the total kinetic energy before the collision? (e) what is the kinetic energy of the 23 kg log after the collision? (f) what is the kinetic energy of the 100 kg block of wood after the collision? (g) what is the total kinetic energy after the collision? (h) compare the total initial and total final kinetic energies. is this consistent with what you would expect for elastic collisions? explain!

Immediately upon reaching its lowest point, a falling pendulum bob has its greatest amount of energy, which is the initial amount of potential energy. a. heat; less than b. heat; more than c. kinetic; less than d. kinetic; more than

Energy flows from the producer level to the level. is called