Understanding Vocabulary in Context

Reread the excerpt below from paragraph 2.

Dolphins and sea lions are trained to find and retrieve equipment lost at sea. They can identify intruders swimming into restricted areas.

What is the meaning of the word intruders in the text?

Tags

CCSS.L.7.4A

CCSS.RI.7.4

CCSS.RL.7.4

Reread the excerpt below from paragraph 2.

The dolphins are also used to detect underwater mines. They find mines buried in the seafloor or floating from an anchor.

What is the meaning of the word detect in the text?

Tags

CCSS.L.7.4A

CCSS.RI.7.4

Reread the excerpt below from paragraph 3.

Bottlenose dolphins are exceptional at detecting mines. They can do it much faster than a machine can.

What is the meaning of the word exceptional in the text?

Tags

CCSS.L.7.4A

CCSS.L.7.4D

CCSS.RI.7.4

Reread the excerpt below from paragraph 4.

Dolphins are effective close to shore, where crashing surf and ship traffic create a lot of noise, Nachtigall says. Mechanical systems can be overwhelmed by all the competing signals, but not dolphins.

What is the meaning of the word effective in the text?

Tags

CCSS.L.7.4A

CCSS.RI.7.4

CCSS.RL.7.4

Reread the excerpt below from paragraph 5.

Their sonar is finely tuned. Dolphins send out a series of sounds that bounce off of objects in the surrounding environment. They pick up the return echoes and map out an acoustic [sound] picture of their environment.

What is the meaning of the word sonar in the text?

Tags

CCSS.L.7.4A

CCSS.RI.7.4